We have Solidworks 2020 administrative image and have problems downloading the 22GB image of 57 500 files to local computers through SCCM.
Because of that, I made ISO-file containing the image, but when I'm trying to delploy Solidworks from ISO, I'm getting error:

The Installation Manager is not running from a valid administrative image folder. Notify your system administrator.

It seems that installing administrative image from ISO is however possible? -> Installing SolidWorks 2018-2019 EDU – Engineering Information Technology or am I missing something?

Yes, I know I could zip the image and unzip on local computer, but that seems useless and waste of time & disk space if it can be done with ISO.