10.05 has unregistered all my clients soft synths as a result none of his album projects files can load

somewhat of a disaster of an update as he book a couple of days to mix also some of the other synths show as loaded in the plug in manager but will not load into song files wasted a whole

8 hours trying to fix for him to no avail any ideas

thank you

edit ps reverting back to previous build did not solve the problem i did ask what kind of idiot

installs new software before a mix and he said he was hoping to stop 50 crashes a day !