1) Always upgrade your DEV/TEST Environment before PROD to verify your upgrade process.
2) If you are using Enterprise Tester 4.10 or below, you must upgrade to Enterprise Tester version 5.1 in the first instance, then to Enterprise Tester version 6.0. You can then upgrade to the latest version of Enterprise Tester.
3) For Enterprise Tester 6.1 and above you must upgrade the .NET framework to 4.6
Should a problem occur, please e-mail firstname.lastname@example.org with the following information:
Old Enterprise Tester Version being replaced
New Enterprise Tester Version being upgraded to
Screen shot of error and as much detail as possible
Log.txt file - typically located in %ProgramFiles%\Catch Limited\Enterprise Tester\Web\App_Data