That said, I'd always opt for a bigger system drive. It's not only an issue with VST3, but, many application put their libraries to the user's Documents or AppData folders. Or... you install Visual Studio, and all those libraries get installed to C anyway. In my experience, it's bet to have 256 GB for the C: drive, better 512 GB.
My next PC will probably have a 1 TB SSD, so, I won't have issues in that regard anymore. I used to have a 100 GB SSD for C: in my current PC, and, that was pretty hopeless...
On the topic, it's nice to see NI migrate all their plugins to VST3. Also the older ones.
