One of my biggest pet peeves ever when it comes to upgrades.
I've yet to fully even move to CC 2015, let alone CC2017 because it is such an immense pain to copy or reinstall the dozens of plug-in's and while it sounds like it's just a simple copy and paste, that's never the case. I don't gripe too much but this one has always annoyed me.
Certainly there should be a way to have that as part of the installation process.
Eric