For everyone using MBS Plugins with PostgreSQL can now get the library in version 12.3 on our website:
Please use option on connection to point to the libpq.dylib for MacOS or libpq.dll for Windows.
You can just include the dylibs/DLLs in same folder as the application and point to them. For macOS you may need to code sign for redistribution as we just signed it with our code signature. The macOS libraries are changed to look for the crypto and ssl libraries in same folder as libpq.dylib file.