As the alternative installer is installed through extracting the contents of the Sage200MFGClient.zip folder, the Redistributables and .Net install are not applied. 

On the client PC which will be accessing the program, follow the below steps - 

1. Navigate to the Manufacturing client install folder, as default C:\Sage\Installers\Sage 200 MFG Client\ (on the server).
2. Open the folder named vcredist_x86 and run the .exe file within here.

Try then reopening the Sage 200 program and opening the affected forms.

It may be necessary to install the .net update from the DotNetFX452 folder if this isn't already applied through Windows updates. This can be done from the same location by double clicking the .exe.