Unable to reinstall Avast Free Antivirus

Apologize if I posted in the wrong topic section.

Recently my Avast interface is not functioning, keep auto-closed (most likely due to latest update).
So I uninstall and attempting to reinstall it, however I’m getting “avast installer cannot continue because the last avast operation was performed without restarting”.

I already did safemode running avastclear.exe.
I also try to submit report through avastsupport.exe however receive “avast cannot generate support file error code 12002.”

System Info:
Package used:web-shield and email-shield.
OS platform: Windows 10 Pro V1909

Other security product:

  1. Windows Security (already try disabled when uninstall)
  2. Malwarebytes (already uninstalled)
  3. Comodo Firewall (only Firewall enabled, others function disabled)

*Note: previously my system already running with Avast web & email shield and Comodo Firewall only.

I hope any support team can assist me with this problem, as the avast log doesn’t have details (doesn’t provide conflict application).
Thank you

https://forum.avast.com/index.php?topic=232641.msg1538338#msg1538338
https://forum.avast.com/index.php?topic=232823.msg1539425#msg1539425

Thanks for reverting.
Will avast analyse and provide fix on next patch/version?

You’re welcome.