Hi there Frédéric,
Thanks for getting in touch with us! I can help you here…
First of all let me note that Event Aggregator doesn’t import XML files, maybe you were referring to CSV instead?
In any case, as you pointed out there’s no way of importing recurring events as such into the calendar (thou it’s a ticketed feature). Options are to import as single events and create the recurrence patter manually (you’ll need Events Calendar PRO for this), or import all instances of the event as single events.
Hope this helps, but in case it doesn’t you can always ask for a refund within 30 days of purchase.
Best,
Nico