Ansys releases are independent, that is 2022R2 does not patch, update or interfere with say 2022R1. There are occasionally service packs for select versions.
Versions do have to be installed in succession however.
It seems as if your download images are corrupt. I prefer to download the .iso files, mount and copy the contents to a common folder.
For network installs, the program is installed in a common network share location. Then, each client machine only needs to run ProductConfig to create shortcuts and environment variables.