Can not Update from 9.3.0 to 9.5.1

[Daniel Henze]

Hello, I can not update my Plesk. It comes following error:

Error: Failed to check whether a new license key is available.
Not all packages were installed.
Please, contact product technical support.

I Use the System Debian 5 64 Bit

Please help

 

[openairhoster2]

Same here. But only on one server, running Power Pack. Update for antother one, licensed for Power Pack light, worked.