I'm not sure where to begin. I use inno to send my program out to others so they can install it. I've been using the same method for several months with no issues. I just recently changed some code around in the VB program that forced users to upgrade. Everyone downloaded the new update and installed it, but only about 90% of the users are able to use the new program. The other 10% say the program isn't functioning anymore (won't pass through the authentication process of the program). One person said they deleted the SP2 installation they just recently did and then the program worked. I'm curious, is there something I'm not fully doing to make sure inno is fully updating their program to the new version? I'm stumped.