Proteus was installed in C:\Program Files , but the license file lives in C:\ProgramData . Windows UAC often virtualizes access. If you installed Proteus as Admin but run it as a standard user, the software looks in the wrong virtual store.
You never installed the key. Run the Licence Manager from the Start Menu (Labcenter Electronics > Proteus > Licence Manager) and re-import your key file. Proteus was installed in C:\Program Files , but
If you are reading this, you have likely just spent the last hour staring at a frustrating pop-up window. You have installed Labcenter Electronics’ Proteus Design Suite (commonly known as ISIS for the schematic capture module), and you are ready to simulate your circuit. Instead of the workspace, you are met with the error: You never installed the key
This error essentially locks you out of the schematic capture and simulation environment, halting your project in its tracks. Whether you've just reinstalled Windows, updated your software, or are setting up a new workstation, this guide will walk you through the most effective ways to fix your license issues and get back to your circuit designs. Understanding the Root Cause Understanding the Root Cause