Webpage down, I can not update any pluging

Hello my friends

I need to update approx. 15 plugins, But I can not do that. I need Help.

This message is show
Update Plugin
Downloading update from http://premium.wpmudev.org/api/dashboard/v1/download/913071/48acc0689e942870de884619b4462c4a61320179…

Download failed. Problem with the SSL CA cert (path? access rights?)

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