Invalid INSTALL.LOG file

Error Message

When uninstalling the ArcGIS/ESRI License Manager, the following error is received:"Invalid INSTALL.LOG file".

Cause

This error is sometimes caused by the License Manager service(s) running at the time of uninstall.

Solution or Workaround

1. Navigate to Start > Control Panel > Administrative Tools > Services.
2. Locate any (or all) of the following three services and stop them by right-clicking on them individually and selecting Stop:
   
   ArcGIS License Manager
   ESRI License Manager
   FLEXlm Service 1
3. Start the uninstall over again.