Cubase 10.0.20 maintenance update

I’m getting an installation error message:
“An installation package for the product Steinberg Library
Manager cannot be found. Try the installation again using a valid
copy of the installation package Steinberg Cubase Update”
I haven’t moved or deleted any files and my e-Licenser is up-to-date, I have downloaded the update from both the Cubase forum and also the Download Manager. This is the first problem I’ve ever had with Cubase updates but my charmed life has come to an end :smiley: Any ideas? Thanks in advance.