I’ve now tried a further uninstall of SGP and ascom 6.4 , reinstalled ascom 6.4 sp1 and sgp 2.6.1.114 but sgp won’t start.
I can open 2.5.0.25 but 2.6.1.114 still not responding
After many attempts at sorting this I went for the upgrade to 3.## and everything is now opening and hardware functioning - all sequences and equipment settings have been retained as well.