I am trying to upgrade the plugin from version 3.0.81 to 5.2.5 on a site where the WP version has been updated continuosly, but this plugin has been left out of the updates.
I now have WordPress at version 3.4.2 and Events Manager at 3.0.81
I tried to follow instructions here: http://wp-events-plugin.com/blog/2011/05/09/upgrade-issues-screencast-walkthrough/
But I cannot activate version 3.0.96 - I see the following message after I click Activate:
Plugin could not be activated because it triggered a fatal error. Cannot proceed with installation, please upgrade to the version 3.0.96 from here first before upgrading to this version.
I tried also upgrading to 5.2.5 directly with automatic updates, also tried just uploading the version 4.300, but nothing works - they all tell me that I should first upgrade to 3.0.96 - but I cannot do it - it won't let me activate the plugin... :(