Bought Century Guitar years ago, opens in previous version of Music Maker, will not open in the 2018 edition. It has a lock key to show it's been downloaded, but it won't accept my activation code. Which is correct!
Strangely, also bought Lead Synth, and that opens fine. I'm guessing that instrument was free with the 2018 edition, or I selected it as one of the free instruments by mistake.
Reinstalling does not help, btw.
Windows 10 pc.