Hi there.
A few ideas here to try and help you.
1. It was recommended by the devs to install the add-on (1.1) to a fresh install of Lock-On (either 1.0 or 1.01 depending upon the age of your original disc). though lots of people patched from 1.02 and have not reported any problems but you never know.
2. The installer for 1.1 might have been corrupted during download. I would try another download to see if this was the problem.
3. Starforce cannot be "got" around. If you install everything in the right order you should have no problems. Install the original, then 1.1 then the 1.11 patch and then reinstall any burner programs (i.e. Nero etc), this will ensure that the burner programs will work.
Don't believe any of the hype about starforce, the majority of the problems that it is being blamed on was also pinned on safedisc when it first came out. Safedisc is used on the original version of Lock-on.
Any more problems don't be afraid to ask. We are always willing to help on these forums. Hope these ideas help.