From: West Palm Beach, FL USA
Deleting steel.prf avoids problems with the upgraded mech.exe. Why, exactly, is a mystery to me, but I've found that if I have problems with the game acting strangely, I can almost always fix it by re-deleting steel.prf. Since it regenerates when you open the game again, it's no huge loss, you just have to reset your preferences.
If you have a game saved, transfer your save files somehwere out of the game while you install the upgrade. Then just copy them back in (minus the old steel.prf, of course).
Incidentally, you don't need the v5.3 upgrade, you can go directly from v5.2 to v6.1.
[ August 05, 2001: Message edited by: Warrior ]
Retreat is NOT an option.