Upgrade Windows agent from 5.0.x to 6.0.4 fails with error

Steps to reproduce:

1. Upgrade an existing Windows 5.0 agent installation with installer "zabbix_agent-6.0.4-windows-amd64-openssl.msi"
2. The dialogs work fine but then the actual upgrade process fails with error "zabbix_agentd.cond.d  No such file or directory" - full message see screenshot attached
3. example of config file see attachment

Result:
The old agent got uninstalled but the new version was not installed and the configuration was not converted.

When running again the configuration has to be entered manually again, but then the installation works.

Expected:
capture the missing directory error gracefully and continue with installation