Hi Stefan,
right, we don´t support XP11.4x any longer, here is the public FAQ to this topic (which we have announced this for more than 6 months now):
The reason is, that XP11.4x is outdated since 09/2020 and will not be updated any longer. The same for the addons. I don´t know any new addon which will be developed for XP11.4x. - therefore we have decided to remove this dataset.
The last distributed AIRAC file was 2014 and this dataset can still be used, we don´t offer outdated files …
Sorry for this bad news …
Cheers,
Richard