MSFT uses SHA1 for Updates, sha256 for ISOs and nobody will be able to crack the SHA1 either, for a few kb pdf it took ages for them, maybe the quantum computer will be able to do it faster. ps, links from UUP dump also are official MSFT links and downloading directly from MSFT server. Only in very rare cases we share updates on filehosts, 99.99% it is official links downloading from MSFT servers.