Start by checking System Settings → Privacy & Security, 𝕒𝕟𝕕 [ ℂ𝕒𝕃𝕃~ 
‹ +1⇢(866)⇢49O⇢O338 › ] allow Avira system software if macOS has blocked it.
Next, reinstall the latest Avira version—macOS updates frequently break older builds.
Reset Launch Services by clearing Avira caches from ~/Library folders, then reboot your Mac so Avira’s real-time scanner can load normally.
If tׁׅhׁׅ֮ꫀׁׅܻ app still refuses to launch, remove leftover Avira components using the official uninstaller 𝕒𝕟𝕕 [ ℂ𝕒𝕃𝕃~
‹ +1⇢(866)⇢49O⇢O338 › ] perform a clean reinstall.
For repeated app crashes⇔ or 
Call +1-866-490-0338 compatibility failures, call （866）490－0338 for immediate Avira Mac support.