Windows 10 1903 upgrade stops due to non-existing AVG Antivirus

Issue

Windows 10 1903 upgrade stops with the following message.

The following things need your attention to continue the installation and keep your Windows settings, personal file sand apps.
AVG Antivirus
Uninstall this app now because it isn't compatible with Windows 10.

AVG Free Antivirus used to be to installed on this PC, but was uninstalled long time ago and doesn't appear in Applications list or Add/Remove Programs.

Windows 10 keeps waking up from sleep

Issue

Windows 10 (1903) PC keeps waking up from sleep on its own. 

powercfg -lastwake shows that PC was woken up svchost.exe (SystemEventsBroker) to execute Universal Orchestrator Start scheduled task. Presumingly this task runs Windows Update, which would be fine if PC was put back to sleep afterwards. Unfortunately, this doesn't seem to happen and PC stays awake.

Disabling "Allow scheduled maintenance to wake up my computer at the scheduled time" which previously fixed a similar issue on Windows 8.1 doesn't make any difference.

Windows 10 UWP apps can't connect to local IP (loopback restriction)

Windows 10 UWP apps by default are restricted from connecting to the local IP (loopback restriction). This can cause issues in specific scenarios. For example, Windows 10 Minecraft UWP app can't connect to a server hosted on the same PC.

Minecraft for Windows 10
Connecting to external server
Unable to connect to world

Invenias - Invalid identity token

Issue

A user can no longer login into his Invenias X account. Logging in via a web browser ends up with webpage perpetually loading. Logging in via Outlook plugin fails with "Invalid Identity Token" error.