Setup window is a two part run. It will show this even if you install LPE as an upgrade from any other LW version.
If everything else seems ok, then perhaps just continue as is. Just seems odd LPE would suddenly ask you after weeks of use. If you suddenly see LW starting up at system startup, then it would most likely be due to virus. This was a symptom with a few viruses that were common a few years ago.
As I hinted, perhaps another program, browser or plug-in has/had become the default magnet or torrent handler & LPE then asked if you wished to change back. I know Windows programs love to nag you about things like that. lol
I generally use a Mac. I guess Windows users become accustom to the nags & being nagged.