Hi...
Have you been able to install the Omniverse Applications like Create, Drive and Cache into that same folder without getting an error?
If you did get the same error with them then there might be a permissions issue accessing that folder.
If that is the case, try opening up the Omniverse Launcher and click on Settings > Settings (top right of the launcher) and try changing the install folders. For example I use the folders below.
Peter
Forum Administrator
www.reallusion.com