A few of the packages required some tinkering with the build-depends and depends to build and work on a Jessie platform, but not too much of that was required. Known issue: I can't move the taskbar from the bottom of the screen. I can get up to where it says to click on the new location, and a red bar appears momentarily when I click on the new location, but nothing happens. I can create a new panel on the top or sides of the screen, though. If you can find more problems or the solution, please post them here.
These particular backports are versioned to appear lower than the versions in Stretch, so they should not interfere with a Jessie-Stretch in place upgrade.
The following commands to add the repository and its key must be done in a root terminal. Sudo users can become root by executing "sudo -i".
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echo 'deb http://download.opensuse.org/repositories/home:/stevenpusser:/cinnamon-backports/Debian_8.0/ /' > /etc/apt/sources.list.d/cinnamon.list
rm -f Release.key
wget -nv http://download.opensuse.org/repositories/home:stevenpusser:cinnamon-backports/Debian_8.0/Release.key -O Release.key
apt-key add - < Release.key
apt-get update
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apt-get -s upgrade
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apt-get upgrade
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apt-get install cinnamon-core