Error while downloading Ultimate Branding plugin

Just signed up to get the Ultimate Branding plugin. Got a zip which contained your dashboard. Installed it, logged in and tried to install the Ultimate Branding plugin via the dashboard. I get this error:
Laster ned installasjonspakke fra (https://premium.wpmudev.org/wdp-un.php?action=install&key=643dcc4e9087623990ccc683c63f0d3c8b90b624&pid=9135)…

Nedlasting feilet. error:0D0890A1:asn1 encoding routines:ASN1_verify:unknown message digest algorithm

Norwegian translation:
"Laster ned installasjonspakke fra" = "Downloading installation package from"
And
"Nedlasting feilet." = "Download failed"

Please help.

Regards,
Vegard