[ There is no e-mail for this; it must be asked on the forum? ]
https://geboortewinkel.nl/en also gives the error message (and writes the below to the license.dat file) :
"You don't have appropriate license for your geboortewinkel.nl. <a href="https://gtranslate.io/">https://gtranslate.io/</a>"
I am not aware of any blocking on our servers. Can you check if something is wrong?
NOTE: most HTTP requests redirect to https:// immediately for this domain. This is not the case for /en/... or for files on disk (like http://geboortewinkel.nl/gtranslate/license.dat) however. So I don't think that has anything to do with it...