Hi guys! I had the same problem, but I think I found a solution.
Download the installer and open it in any archiver, I used 7zip
Unzip its contents to any folder, and find "“DesignDatasmithMax2022. dle” in this folder (for your version of Max), copy them to the Plugins directory from 3ds max.
Then copy “UnrealStudio_Data switch_Attribute_Holder_ModifierDesign2022.ms” to the Scripts\startup directory.
It worked for me)
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