This message will appear if you try to import or export a database on a computer that doesn’t have Postgres installed on it.
It can however also appear in some other circumstances where Tscore is unable to locate the path to the Postgres ‘bin’ folder.
This can be either: (1) using an unsupported version of Postgres or (and this is the really weird one!) if you manage to install postgres into the Windows\System32 folder. THis folder has restricted rights that means TScore cannot detect its existence.
If you’ve managed to do this, there is one way you can fix it (other than reinstalling Postgres in a better place).
Create folder called (for example) C:\postgresbin
Copy the contents of the installed Postgres\bin folder into this new folder.
Use Regedit to set the value of HKEY_CURRENT_USER\Software\VB and VBA Program Settings\TScoreXPG\Settings\PGPath to containt eh bin folder path with a trailing backslash. e.g. c:\postgresbin\
Restart TScore and it should start working again.