Install LMS 7.9.1 on DS 710+ results in

I have a Synology DS 710+
with DSM 5.2-5967 Update 7
and I'm trying to upgrade the LMS because of the known issues with the old version.

I removed the official package and restarted the server before trying to install.
I downloaded files from the sourceforge page of pinkdot

I tried several of the LogitechMediaServer 88F.... packages.
but when I try to upload the .spk file in the package center, I get :
package not supported on this Diskstation.

Can someone help me, please.
Like pinkdot maybe?