Open and navigate to: C:\ProgramData\SDL\SDL Trados Studio\Studio3\Data (Note: You may need to enable "Show hidden files and folders" in Windows settings). Find the file named Studio.lic and delete it.
This guide explores what Error 151 means, why looking for "activation codes" online is often a dead end, and how to properly resolve the issue to get your CAT tool back up and running. Understanding SDL Trados Studio Error 151 sdl trados studio 2014 activation code 151 better
You can usually find it under the "Downloads & Licenses" tab in your official RWS/SDL user portal. Understanding SDL Trados Studio Error 151 You can
If you are searching for a "free" or "leaked" activation code to bypass this error, you are likely putting your workstation at risk. For professional translators
Security software may flag the licensing service as suspicious, blocking its execution.
For professional translators, using unlicensed software can be a breach of contract with many Language Service Providers (LSPs). How to Fix Error 151 (The Legitimate Way)