Avast detecting install as virus

I'm new to PDF Creator, I tried to install today but Avast detected a file called lavasoft overlay new_setup_progress_en-v3.exe as "infected with Win32:UnwantedSig [PUP]. This happened exactly when I launched the setup exe file. What is this file? Is it safe to install PDF Creator normally? Thanks.

I have this problem as well when trying to update pdf creator.

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