500 Error Activating Plugin

Hey guys…I’m reworking an older site for a client who has had Events Pro working flawlessly for the last few years. I’ve cloned the site on my dev server and am making some updates that haven’t been made in a while. I renewed my license and downloaded the latest version, installed it and when I activated it I get a 500 error. I followed your troubleshooting guide and did the following:

– Disabled all plugins
– Used base 2015 theme
– First activated Events Calendar, no error.
– Then activated Pro, 500 error
– Then I tried in reverse order…activating Pro then the base plugin
– When activating Pro first, no error
– Activating the base plugin second I got a 500 error

So, it apparently doesn’t matter the order, they all give me the same error when the plugin.php screen attempts to reload. I’m unable to access any pages on the backend without getting the 500 error.

On the front end, here’s the fatal error:

Fatal error: Class ‘Tribe__Events__Pro__Recurrence__Permalinks’ not found in /home/jasoncyr/public_html/clients/gnps/wp-content/plugins/events-calendar-pro/src/Tribe/Main.php on line 171

Thanks for your help!