Incorrect. Hence the reason Avast has exclusions. Every single anti virus does. I have several items excluded from Avast such as MBAM, CCleaner, Process Explorer, ,Marcium Reflect, Google Drive, UltraDefrag.
So etm42 to answer your question. Open up Avast and click on setting on the top right. Go to “global exclusions” and add what is needed there. Its that easy. You can also exclude from the behavior shield. Every pc game requires you to disable your antivirus while installing the game to avoid issues.