Hello all, it's been a long time! I'm trying to upgrade 1.84 to 1.91 and the upgrade install says I'm running an incorrect Version? Whiskey Tango Foxtrot???
The solution is to reinstall SE4 over your current install, then patch it to 1.91. The patch program used for SE4 has some issues related to time stamps on the executable, and sometimes thinks it is not the valid SE4 executable file.