Your AutoCAD Licence Is Not Valid – How to Fix This Error Quickly
Seeing “Your AutoCAD licence is not valid”? Don’t panic. This message does not always mean that your licence is illegal or expired. It can also be caused by an Autodesk Licensing Service problem, damaged sign-in data, a blocked internet connection or incorrect system settings.
Try the fixes below in order—most take only a few minutes. If your licence has expired, your version is no longer supported or you simply need CAD working today, you can also open and edit your existing DWG drawings in GstarCAD.
Quick fixes for “Your AutoCAD licence is not valid”
- Check your Autodesk subscription and assigned products.
- Restart AutoCAD, your computer and Autodesk Desktop Licensing Service.
- Install current AutoCAD and Autodesk licensing updates.
- Check your internet connection, firewall and proxy.
- Synchronise the Windows date, time and time zone.
- Sign out of Autodesk software and sign back in.
- Repair or reinstall Autodesk licensing components using official Autodesk instructions.
- Contact Autodesk Support or your authorised reseller.
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What does “Your AutoCAD licence is not valid” mean?
The warning means that AutoCAD could not verify your right to use the installed product. It may appear at launch, after a software or Windows update, when you change computers, or when AutoCAD performs a periodic licence check.
A genuine, active licence can still produce this message. Common causes include a temporary Autodesk service incident, an outdated licensing component, damaged local sign-in data, account or product-assignment problems, network restrictions and an incorrect computer clock.
If the installation is unauthorised, modified or obtained from an untrusted source, do not try to bypass the licence check. Uninstall it and replace it with properly licensed software. Unauthorised software can expose your drawings, credentials and business network to malware, and it does not provide reliable updates or support.
How to fix “Your AutoCAD licence is not valid”
Work through these steps from top to bottom. Menu names can vary by AutoCAD release and licence type. For changes to licensing files or components, use the instructions for your exact product version on Autodesk’s official support site.
1. Check your Autodesk account and subscription
Sign in to your Autodesk Account and confirm that:
- Your subscription or licence is active.
- AutoCAD is assigned to the correct user.
- You are signing in with the email address that owns or has been assigned the licence.
- The installed AutoCAD edition and release match your entitlement.
- There are no billing, renewal or administrator-assignment issues.
If your employer manages the licence, ask the Autodesk account administrator to check your product assignment before making changes on the computer.
2. Restart AutoCAD and the licensing service
Close all Autodesk applications and restart Windows. If the message returns, open the Windows Services app, locate Autodesk Desktop Licensing Service and confirm that it is running. Restarting the service can clear a temporary validation failure.
3. Update AutoCAD and Autodesk Licensing Service
Install available updates through Autodesk Access or the update method recommended for your version. An old licensing component may no longer communicate correctly with the account or activation services. Restart the computer after updating and test AutoCAD again.
4. Check your internet connection, firewall and proxy
Open a normal website to confirm that the connection works. Corporate firewalls, VPNs, proxies, DNS filters and security software can block authentication traffic even when other websites load normally. If you are on a managed network, ask your IT team to check Autodesk’s current connectivity requirements and permitted domains.
Avoid permanently disabling antivirus or firewall protection. A short diagnostic test should only be performed according to your organisation’s security policy, and protection should be restored immediately.
5. Synchronise Windows date and time
Authentication can fail if your computer’s date, time or time zone is wrong. In Windows settings, enable automatic time and time-zone detection where appropriate, select Sync now, then restart AutoCAD.
6. Sign out and refresh your Autodesk sign-in
Sign out of AutoCAD and other Autodesk desktop applications, close them, restart the computer and sign back in with the licensed account. This can refresh an expired or damaged authentication token without altering your drawings or program settings.
7. Repair licensing data with official Autodesk tools
If the account is correct but validation still fails, follow Autodesk’s current repair or reset procedure for your AutoCAD version. Autodesk may recommend its licensing support tool, a licensing-service repair or a clean sign-in reset.
Important: do not delete FLEXnet, licensing or registry data based on instructions for a different release. These components may be shared by several Autodesk products. Back up important work and follow the official procedure for your exact version.
8. Reinstall licensing components or AutoCAD
If repair does not help, reinstall the current Autodesk licensing component using Autodesk’s official installer. Reinstall AutoCAD only after the account, network and licensing service have been checked; otherwise the same error may return after a lengthy reinstall.
9. Check for a wider service issue
When several users receive the warning at the same time, the cause may be an Autodesk service incident rather than a problem with each computer. Check Autodesk’s health information and support channels before resetting multiple installations.
10. Contact Autodesk Support or your reseller
Prepare your AutoCAD version, Windows version, Autodesk account email, the exact error message and a note of the steps already tried. Do not publish serial numbers or account details in public forums.
Still seeing the licence error? Choose the right next step
| Your situation | Best next step |
|---|---|
| I have a valid, active AutoCAD subscription | Continue with Autodesk troubleshooting or contact support. |
| My employer owns the licence | Ask the account administrator to verify your assignment. |
| My subscription expired | Renew it or compare properly licensed CAD alternatives. |
| I use an old or unsupported release | Review upgrade and replacement options before changing system files. |
| I need to work on DWG drawings today | Install the free GstarCAD trial and test one of your own files. |
| I do not want another annual subscription | Compare GstarCAD perpetual-licence options. |
Need to keep working? Try an AutoCAD alternative
A licence problem is especially disruptive when a deadline is approaching. GstarCAD gives architects, engineers and CAD professionals a practical way to continue working in a familiar environment while they decide what to do next.
- Native DWG workflow: open, edit and save DWG drawings.
- Familiar interface and commands: reduce retraining for experienced AutoCAD users.
- Perpetual licence available: buy once and keep using the licensed version.
- Flexible choices: perpetual, annual and network-licensing options are available for different teams.
- Free 30-day trial: test the software with your own work before buying.
Can GstarCAD open my existing AutoCAD DWG files?
Yes. GstarCAD is designed to work directly with DWG files. You can open an existing drawing, edit it and save it as DWG without converting the project to a proprietary replacement format.
The interface, command names, aliases and everyday drafting workflow will feel familiar to many AutoCAD users. That helps individuals and teams become productive quickly. Support for advanced customisation and third-party applications depends on the GstarCAD edition and the specific tool, so test critical LISP routines, fonts, plot styles, external references and plug-ins during the trial.
For a low-risk migration test:
- Keep an untouched backup of the original DWG and its references.
- Install the GstarCAD trial on a suitable computer.
- Open a representative drawing with fonts, Xrefs, layouts and plot styles.
- Edit and save a copy, then reopen it and verify plotting.
- Test any essential scripts, LISP routines or specialist plug-ins.
AutoCAD subscription vs GstarCAD perpetual licence
AutoCAD is commonly licensed by subscription. GstarCAD also offers a perpetual licence: you pay once for the selected version and can continue using that licensed version without a mandatory annual renewal. Optional upgrades, support arrangements and network-licence needs should be considered separately.
A perpetual licence can make budgeting more predictable for organisations that keep CAD workstations for several years. A subscription may suit businesses that always require the latest release and bundled services. Compare the editions, included capabilities, support and total cost over your expected ownership period rather than looking only at the first payment.
How to avoid CAD licensing problems in the future
- Use genuine software from the developer or an authorised reseller.
- Record renewal dates, licence owners and user assignments.
- Keep licensing services and supported product versions updated.
- Review firewall, proxy and security changes before deployment.
- Synchronise system time automatically.
- Plan licence reassignment before replacing computers or employees.
- Keep secure backups of DWG files, Xrefs, fonts, plot styles and customisations.
Frequently asked questions
Why does AutoCAD say my licence is not valid when I paid for it?
A paid licence can still fail validation because of a service outage, incorrect account, missing product assignment, outdated licensing service, damaged sign-in data, network restriction or incorrect system time. Confirm the account and entitlement before repairing local components.
Can I use AutoCAD offline?
Some installations can work offline for a limited period, but periodic sign-in or online validation may still be required. The exact rules depend on the product, release and licence terms. Check Autodesk’s current documentation for your licence.
Will reinstalling AutoCAD fix the licence error?
Not always. If the cause is the account, product assignment, network or a wider service incident, reinstalling AutoCAD may not help. Check those items and repair the licensing service before doing a full reinstall.
Should I delete FLEXnet or Autodesk licensing files?
Only when Autodesk’s official instructions for your exact product and version tell you to do so. Licensing data may be shared by several applications, and deleting the wrong files can create additional activation problems.
What should I do if my AutoCAD licence has expired?
You can renew an eligible AutoCAD subscription or move to another properly licensed CAD application. If you want to avoid a mandatory annual subscription, compare GstarCAD’s perpetual-licence options and test your DWG workflow during the free trial.
Is GstarCAD compatible with AutoCAD files?
GstarCAD works directly with DWG files and uses familiar CAD commands and workflows. Test representative drawings, custom fonts, Xrefs, plot styles and any specialist customisations before a wider rollout.
Does GstarCAD offer a perpetual licence?
Yes. Perpetual-licence options are available, alongside other licensing choices. Review the current UK pricing page to compare editions and terms.
Get back to your DWG work today
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