It used to be possible to download them without a MSDN account. Two weeks ago they changed their download links so you have to have a MSDN account.
Not talking about MSDN Account. Made my own .ISO on 20 March. I don't wait for Microsoft to release .ISO's.
I don't really make it a habit to archive dead urls, and I'd be having a hard time figuring out which dead URLs are the right dead URLs. Sorry.
There never were official msft url's to official 18362.30 MVS iso's. You probably saw wzor links, to their cloud en-US and ru-RU only, or the enterprise eval links, they got disabled by msft. But you still can use the 18362.30 MVS Repo from @GezoeSloog, by svf patches.
I would go with a original MSFT MVS iso, as long as the checksums are verified, then the source of the download doesn't matter. Never use a homebrew iso you didn't make yourself, specially ....
Exactly this ^^^. I am amazed, (no, APPALLED) that someone would actually use a non-verified file of any sort these days. Computers are much more forgiving than a cell phone. At least you won't end up with a brick.
I believe that once the 1903 may update is offered to the masses it will still be 18362.1 as the base and the latest CU would make it 18362.113. I could be wrong but its generally been that way.
As far as we now see, they released 18362.30 to the devs, so most likely, the build released on MCT (by ESD), will probably be 18362.113 +. And the unlocked techbench iso's probably will be of that same build too.