I can't install Unreal Datasmith exporter for 3ds MAX 4.26

Hello GuiLToma,

Obvious question but do you have the msi file in the path you are running this command? Could there be a mistake in the spelling of the file name? The error message implies that it did not find the msi.

Did you try to just plainly run the msi first? I recommended to run from command line as a mean to get the install.log file and more details on while the installation was failing.