In Gpg4win-3.1.15 we introduced a safeguard for users accidentally creating bad permissions in the GnuPG data folder by running Kleopatra as Administrator T5212.
This is important because the plugin system of qt might allow injection by other software running with user privileges to then also be executed in the context of the Administrator. And of course in the case that the user only temporarily runs with elevated privileges we get perimission problems on the homedir.
But now we get reports from users completely bypassing windows privilege separation and running everything as Administrator. In that case they can no longer use Kleopatra.
The error is a bit to hard, even though we want to discourage such users we don't want to loose them or have them on an old version so we should convert that to a clear warning.