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Thank you in advance for your patience and understanding on the matter.
As far as I see in your screenshot, you have Debian 7.11. Yes, Debian 7 is listed in supported OSes here Software Requirements for Plesk
But actually, it is not supported. This is a bug in Software Requirements and I will forward the corresponding request to the responsible person for fixing this bug.
So, this is the reason for this initial issue.
Hi All, I found the problem. new Plesk version don't support Debian 7. So i need to upgrade my OS to Debian 8 or 9 first.
"* - Debian 7 is supported in Plesk Onyx 17.0 and Plesk Onyx 17.5, but is not supported in Plesk Onyx 17.8 and later."