I used this process
https://www.laptopmag.com/articles/take-ownership-folder-windows-10-using-file-explorer
This helped me to regain control of the Affinity folder, which somehow I had lost via by doing the update (the update gave ownership of the folder to SYSTEM). The log file was saying that I could not access the folder (even though I am Administrator), therefore the update was failing. It would not let me rename the folder or re-direct the install to another folder.
Once I regained control, I deleted the folder , not sure if that was the right thing to do - could have just tried to install (I was just frustrated by then). After deleting the folder, the install went through fine, and I had access to the newly created Affinity folder.
Hope this helps.