Hi!

I've purchased the Joomsef 3.x Virtuemart SEO bundle for one of our sites. I can't get it to check the registration and keep getting errors that upgrade informatie cannot be retrieved.
The errors on the upgrade page:

==
It was not possible to retrieve latest version information. The upgrade server may be temporarily down. Please, try again later.
It was not possible to check your registration information. The upgrade server may be temporarily down. Please, try again later.
==

I know the server is not down, as on other sites (on other servers) I can connect to the upgrade server.
Could you please help me?

Kind regards,

Nathalie