KV331,
Woohoo!
Did a deep clean of all the Synthmaster 2 files system wide (including the registry) and followed the "clean install" steps as above.
Can confirm everything installed in the right spot and yes - SM2 now appears correctly within Studio One and has full operation via Komplete Kontrol and my S61 MKII.
All good - much thanks for your efforts to get this working for us.
Cheers
VP