Hi! it greatly depends on the age of the thing you get from my store, I normally use OSSL of the last version of the sim (currently 9.2.2), so a new product like my Adams-Farwell car will not work in places that are running 9.2.1 servers (much less bullet sim engines).
Other stuff will depends on the permissions to run OSSL, that's easy to fix though, if you go to my store and click con the blue sign you'll get a simple set of instructions on how top enable your sim for OSSL to run PMAC, SFPoser and other OSSL dependent scripts. Personally I believe everyone should enable such permissions.
Other than that if you have a problem with a particular script let me know, also remember that all my stuff is full perm so feel free to mod any of my objects to suit your needs as best as possible =)