The last line of the Octoprint.log tells us that the plugin is being installed and the plugin_pluginmanager_console.log shows that the plugin was installed successfully.
We need logs from the failed restart/startup.
If the webinterface doesn't start anymore you get the logs via ssh:
Ssh into the pi and run ~/oprint/bin/octoprint systeminfo .
Then download the generated systeminfo bundle zip with WinSCP (it's an ssh file explorer) and upload it here.
I tested on two different SDs and the error always at the same time. During the installation of the plugin always at the same time the system shuts down and shows this message