[Solved] Invalid Licence / Demo account

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Hello everyone,

I recently created an account on ******, downloaded MetaTrader 5 (MT5), and successfully connected my demo account.

However, I’ve encountered an issue when attempting to backtest paid Expert Advisors (EAs). Specifically, I receive an “Invalid License” error during testing. Interestingly, free EAs work without any problems.

To troubleshoot, I reinstalled both Windows and the MT5 platform, but the issue persists.

Any insights or suggestions would be greatly appreciated.

Do you know how to fix it ? 

 
If people get the same issue, its because the last version of MT5 not working....
I found previous version like 5055 and its working well now.
 
Me too! I tried a bunch of EA demos a while back and they worked fine. Now when I try those same ones, I'm getting 'invalid license' errors, like, '2025.06.04 19:36:15.848 Core 1 2025.05.01 00:00:00 invalid license'
 
Agus Riyanto #:
Me too! I tried a bunch of EA demos a while back and they worked fine. Now when I try those same ones, I'm getting 'invalid license' errors, like, '2025.06.04 19:36:15.848 Core 1 2025.05.01 00:00:00 invalid license'

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Forum on trading, automated trading systems and testing trading strategies

invalid license

Laurovici Daniel, 2025.06.04 05:17

I finally managed to get 4755 as build and everything works as normal

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Forum on trading, automated trading systems and testing trading strategies

"Invalid License" help please. error when using DEMO EAs but not FREE EAs

Joseph George Trotter, 2025.05.16 17:50

Thank You!

I reinstalled MT5 and deleted personal data, and the issue was fixed! Hope this helps anyone in the future




 
Sergey Golubev #:

The reply - 


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FYI reinstall MT5 not working anymore from yesterday as MT5 proposed ONLY the last version from yesterday and it's not working for backtest.

The ONLY way it's to find previous version of MT5.

 
Agus Riyanto #:
Me too! I tried a bunch of EA demos a while back and they worked fine. Now when I try those same ones, I'm getting 'invalid license' errors, like, '2025.06.04 19:36:15.848 Core 1 2025.05.01 00:00:00 invalid license'

You just need find previous MT5 as the last update is broken for backtest.

 
Zolia #:

You just need find previous MT5 as the last update is broken for backtest.

The latest officially stable version/build for MT5 is build 4755.
And the builds started with 5050 and more - they are beta builds only (not stable builds).

Forum on trading, automated trading systems and testing trading strategies

[Solved] Invalid Licence / Demo account

Zolia, 2025.06.04 11:46

If people get the same issue, its because the last version of MT5 not working....
I found previous version like 5055 and its working well now.

Build 5050 and 5055 and more - beta builds only.
The latest stable build is 4755.
 
Please update Agent Manager to version 5065+ and restart the agents. If there are other manager instances, stop the agent services from them and restart these managers as well.
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