Thanks for stepping in Noel

You've got a tailing square bracket on the key name:
REG DELETE HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Component Based Servicing\ComponentDetect\amd64_netfx-mscorjit_dll_b03f5f7f11d50a3a_6.1.0.0_none_511b60f4fddfa6f9
] /v "Package_3_for_KB2518869~31bf3856ad364e35~amd64~~6.1.1.0.Trigger_3"
And it needs speech marks around the key name as well because of the spaces in Component Based Servicing. I've fixed it, and will use it now

Thanks again.
@Louis
Noels suggestion is perfect here - it will tell us what the error is, assuming there is one. I have amended Noels script, and I would like you to run this from an elevated command prompt (run as admin). Copy the output into your next post please.
REG DELETE "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Component Based Servicing\ComponentDetect\amd64_netfx-mscorjit_dll_b03f5f7f11d50a3a_6.1.0.0_none_511b60f4fddfa6f9" /v "Package_3_for_KB2518869~31bf3856ad364e35~amd64~~6.1.1.0.Trigger_3"
Like last time, it's just one command and should run properly this time as I've fixed the formatting issues we had with the last reg.exe fix we tried.
Tom