The Syntronik Fee sounds are installed when you install Syntronik Free. There is no separate library download. If you still have that installer, look at its file size,as I mentioned above.
Search your disks for "52__Syntronik Free" (yes, that is 2 under-bars in the folder name)
There's a link to the Technical Support form at the top of this page:
https://www.ikmultimedia.com/contact-support/search_faq.php?quick=QUICKSW
(reached via "Contact Support" > Software > Search FAQs. It is done that way as may issue are already covered in the FAQs.)
You are trying to do a lot from a standing start. Take it step by step and you should be OK.