I’m sorry the upgrade has (so far) not worked with your particular setup.
As you can see with our activity we’re doing our best to improve the current version of the plugin. We’re working as fast as we can considering this is currently a free plugin we’re working on in our free time.
A code rewrite was necessary for 2.0 as the original plugin hadn’t been updated since Dec 2012, so we’re working with a completely new architecture that is more maintainable going forward.
As you can see in our support forums (https://www.ads-software.com/support/plugin/google-calendar-events), we made is as simple as possible to revert to the old version of the plugin when all else fails.
https://www.ads-software.com/support/topic/if-you-need-to-revert-to-0731
In fact, you can download any particular tagged version.
https://www.ads-software.com/plugins/google-calendar-events/developers/
www.ads-software.com allows no way to “fork” or otherwise easily maintain two different “current” versions of the same plugin, otherwise we would go this route.
We appreciate any detailed feedback and suggestions you can give us in the forums, and although we may not respond immediately, we do read them all.