I did a fresh install of 18.50.0100 on one of my computers and when I launched it I saw the message about the trial period because I had forgotten to instead update my portable version which is on that computer. Immediately at that screen I chose to quit instead of continuing.
Doing that has created a single file in %appdata%\XYplorer starting with the name xyerrorlog. If I open it in a text editor it just has this:
QueryUnload: Error 91 - Object variable or With block variable not set