I researched the topic of temporarily disabling Bitdefender for testing purposes, and I found that it's basically impossible. My problem is, some stock apps, more specifically Microsoft Store, Calculator and Calendar failed to launch after a Windows update. This is a known issue, it's not just me. Most troubleshooting guides suggest some steps (e.g. running wsreset and entering various powershell commands) that need UAC and Windows Defender running. Currently they are disabled because replaced by Bitdefender.
Any suggestions to fix this? The last resort is a clean reinstall of Windows, which I'd like to avoid. What I need is just some clue if it's really impossible to disable Bitdefender just for the duration of troubleshooting. Thanks!