If you have SMF 2.0 you can try to emulate the version of SMF 2.0 in the package manager their is a link to try a different version to attempt to install.
I am using 2.0.2 and everything is working correctly (Except Ad Seller) I have two options I guess:
1. Try to emulate (But which version)
2. Buy another copy (But will it be compatible with my themes and version 2.0.2)