Plugin Wont Enable

I have used this plugin for some time and it’s been very useful. But it recently stopped working and after trying to update, the newest version wont activate on my site. After clicking active on the plugins page, it says its been activated at the top, but the plugin never actually activates.

I saw you recommend downgrading in a different thread for a different problem, and wanted to try that, but don’t know how to acquire an older version of the plugin.

Thanks in advance for your hep.