Adding plug in's to existing programs


I use various programs in which the usability of the product can be expanded by the installation of plug ins or dll’s. Some plug ins I come across come packaged as installers. Sometimes, upon running some installers, the sandbox will alert me of the unknown process and immediately place in the unrecognized files list as well as create a defense plus event listed as create process / block file. After this happens, I will find that the plug ins (dll’s) did not get installed fully, leaving them useless.

I’m wondering what steps I should take to ensure the successful full installation of these program additions?