how iso file is updating and is copying files on usb usefull

Hello, I just download "wsusoffline-w61-x64" the last april (one zip).
I had UpdateGenerator and UpdateInstaller (in client file), but I'm asking what about the iso file, how does it works, or how may I use it for what purpose?
I saw inside (thanks to PowerIso) that the same installer exe is in it.
I did not create an usb drive, but only have the whole files on my HDD.
Another question if possible: may I copy the whole files on USB and then update anoter PC this way?
it seems to be obvious for knowing people, sorry despite I read a lot of questions on this forum and I stay stucked about these questions.
Thanks a lot for any advice.
A little less more: is updating by overwriting over with the last new WSUS the correct way?
Best regards
I had UpdateGenerator and UpdateInstaller (in client file), but I'm asking what about the iso file, how does it works, or how may I use it for what purpose?
I saw inside (thanks to PowerIso) that the same installer exe is in it.
I did not create an usb drive, but only have the whole files on my HDD.
Another question if possible: may I copy the whole files on USB and then update anoter PC this way?
it seems to be obvious for knowing people, sorry despite I read a lot of questions on this forum and I stay stucked about these questions.
Thanks a lot for any advice.
A little less more: is updating by overwriting over with the last new WSUS the correct way?
Best regards