Similar issue here. I have downloaded the “UnrealDatasmithMaxExporter_4_26_2.msi” multiple times now. I am not running it through the command line but when double clicking this file it runs through the initial process (user agreement, select your version of max, do you want 62ab3bb5.msi to make changes). Then it is looking for “UnrealDatasmithMaxExporter.msi”. Instillation stops at this point.
Not sure if that is a file the msi creates or what. I don’t recall having this issue with a previous install on another machine. Any positive direction is appreciated.