Invalid magic number

[zabadabadoo]

@AdmiralObvious

I don't know what the 256SHA is.

SHA256 file checksum. You should verify that the .iso file you downloaded is not currupted, by testing its calculated SHA256 checksum against the published SHA256 checksum on the Zorin website.
See this:

Methods of downloading Zorin OS

Make sure you check the SHA256 Checksum of downloaded file (particularly if downloaded from 3rd party site), against that published on the Zorin website. You can verify whether the file has been downloaded correctly without corruption by verifying that its sha256 checksum matches the one listed after pressing the “View sha256 checksums” button on this page: Download - Zorin OS To verify the checksum, we would recommend you to use an app called QuickHash, which can be downloaded from here: http…