Hi,
Try getting the bridges from here:
Vcl bridge: https://download.tmssoftware.com/flexcel/trials/vclbridge32.zip
Fnc bridge: https://download.tmssoftware.com/flexcel/trials/fncbridge32.zip
There seems to be a cache problem where the old setups that don't support Delphi 12 are still being downloaded, I am not sure why. See TMS VCL Grid Excel Bridge for Delphi 12 - #10 by Feichtenschlager_Thomas