Hi,
Yes the old forum was lost due to some sort of corruption and could not be recovered… so shiny bright new replacement 
As for the voicebanks, I guess you have not unregistered them on the old computer? That would be the easiest start point if possible, also for SynthV itself. I guess your original email link will have long since expired, I keep a copy of each install file on my computer - won’t help with the licence issue but does allow reinstalls if I uninstall a voice (AFTER unregistering it).
Voice licences vary from provider to provider, Dreamtronics allows three simultaneous installs, my copy of Solaria has a rather vague licence condition:-
but in previous cases like this (HDD crash or new machine) the user has had to go back to the supplier and explain why they have ‘lost’ a licence and need the activation code resetting, I think it has always had a positive outcome?