This version was released for MagiCAD for AutoCAD.
AutoCAD
AutoCAD installation issues with the previous version of MagiCAD Connect for AutoCAD (2020.5.13.457)
The EXE-installer of the previous version (2020.5.13.457) contained a bug that prevented users who had AutoCAD 2021 installed, from installing the Connect version to any other AutoCAD version except 2021.