WinDivert often extracts itself to your System32 folder or keeps a temporary handle in your Temp folder. Navigate to C:\Windows\System32\drivers . Look for a file named WinDivert64.sys or WinDivert.sys .

The simplest fix: save work, restart the system, and re-run the installer. This clears pending file operations, unloads any orphaned driver instances, and resets the SCM state.