Levdom: UPDATE: in case someone hasn't seen it, GOG posted an update on twitter and the problem is indeed on the server's side.
"Due to our storage and CDN provider's outage, we are encountering technical issues that may cause difficulties in downloading and updating your games both through the GOG GALAXY client and GOG Store. Downloaded files are in no way affected.
We are trying to mitigate this external problem by switching to our secondary storage while our provider is restoring data. We will update you as soon as this is resolved. Apologies for any inconveniences caused."
Thanks! Since twitter recuires an account I cant access it anymore.