Not beating the drum for G9 here, I haven't used it but hear bad things...
If you're dead set on manual install, and you HATE "uninstalling" because of the pain factor, try this analgesic:
Simply keep your generations, categories, test subjects, etc. in separate libraries. It's simple to make a "quarantine" library and add it to Daz's search path. If you hate it and want it gone, it's a simple matter of removing the library from the path. You could actually make a separate library for every product, but that might get cumbersome on its own... but testing out a new product, it just makes sense. When you're satisfied it should be a permanent addition to your runtime, move that library's contents to your main library, whichever one that is.
And converters & converted assets are the work of angels, always welcome here!