false alarm with trustworthy building physics software

Hello, since 8 days I ave a big problem: Avast Internet Security tells me, my bulding physics program >PsiTherm5< has a " Win 32:Malware-gen"! Avast delete the “cad.one.exe” of these program. Has anybody an idea, what to do? I tell Avast, this program is an exception. No success. Thankful for any held.

You can report a possible FP here: https://www.avast.com/contact-us.php?subject=VIRUS-FILE