Just chiming in on this thread - bought Sychronized solo strings today, and am experiencing a ridiculously slow install (as in, at this rate, this will take the entire weekend).
I'm on a 2018 Macbook pro 13", w/ two external SSDs. I've installed tons of VI libraries, and also a few Synchron ones (Epic Orchestra, and a couple of the Big Bangs) and Install was always a quick affair.
I've seen a few posts on this, and was just wondering if there was a solution or at least some state-of-the-art troubleshooting tips?