@paulderdash, I have a VM that has been running Windows 10 since September, 2014. This VM is currently running 64-bit 1703, Build 540. I am using HMP.A in this VM with beta build 712. When build 502 came along the update didn't install the first time. I disabled Credential Theft Protection and then that build installed. On Patch Tuesday when build 540 came out, it installed with no problem. Credential Theft Protection was still disabled. It may be some other software on your system? This VM of mine has virtually no other software, just some apps from the store, a couple of browsers and a couple of outside apps. It also runs Windows Defender and HMP.A beta build 712.