Updating Windows 10 Quicken Premier Ver R36.38 Build 27.1.36.45

In case of Patch installation error "Server file failed to load … Index and length …"

please follow instructions here:
https://www.quicken.com/support/patch-error-unable-check-updates-server-file-failed-load
If the error message is about a file named "wyserver.wys", the problem is the Windows User Account name. If your Windows User files are located in a folder named, for example,
"C:\Users\John Doe\..." (with a blank space between John and Doe)
you need to create a new Windows User Account with Admin privileges and a name that does not contain a blank space, e.g., "John". Use the new account to install or update Quicken. Afterwards return to using your regular Windows User Account for running Quicken and doing all other work, as usual.

If the user name is not the cause, try to enable and use the hidden Administrator account.
See https://www.howtogeek.com/howto/windows-vista/enable-the-hidden-administrator-account-on-windows-vista/ how to do that. Supposed to work in all Windows versions.