From what I understand, SB will eventually retire the 32-Bit version, albeit no date has been set just yet.
Using 32 Bit PEMPro, I found that it could not handle my QHY268M Pro Bin 1x1 due to 32 Bit file size limitations. However, PEMPro would work when I binned the QHY268M Pro 2x2.
When I used PEMPro and TSX 32 Bit the T-Point Model only applied to the 32 Bit TSX environment and could not be migrated to the 64-Bit environment.
I found it clunky using the PEMPro/TSX 32 Bit combination then disconnecting my imaging system and mount to then open TSX 64 Bit and reconnect everything. Even though one might only run through the PEC Training routine once or twice a year, I decided not to operate in both 32 and 64 Bit TSX environments.
Having to maintain Pointing Models, Telescope, Camera, Focuser, Filter Wheel and Rotator Profiles, Custom Chart Settings, Custom Tool Bars, Custom Horizons, User generated Chart Elements and SDB’s, etc. in both a 32 Bit and 64 Bit TSX environment represents a major maintenance overhead, so I have settled on TSX 64 Bit just so I can maintain a single environment and update one instance of the SW.
The new beaut (sadly broken) Train PEC Routine in TSX 64 is quite neat, pity it doesn’t work for us poor sods in the Southern Hemisphere.
When I purchased the MX+ I was not aware that I was acquiring a non-compliant system – it does not meet the requirements of PEC Training as stated in the literature and user guide when operated in the Southern Hemisphere. Worse still, it seems there are no plans to fix this long-standing, much reported, fault.

Cheers
Dennis