Version rollback?

[delphcon]

Just downloaded the latest update. It is total junk, all standard preset tones have been ruined and most of them only play out of the left channel now. Stuff from ToneCloud is even worse, since it's not been updated. Most are distorted, even the clean ones. Too much noise, there is something whacking the gain up early in the chain now.
Problem is, unlike other responsible software producers, PG don't seem to offer any kind of rollback to an unbroken version. There was no warning that the DSP had been significantly altered unbtil the bloody thing was installed and started up. Does anyone know if there is a "magic portal" where this might be possible?