Spider calendar?

I have a site using SpiderCalendar that is broken. I posted a support topic on that plugin’s page: https://www.ads-software.com/plugins/spider-event-calendar/ then went out to the Plugin Website, which is 10Web, to try to get support, and was sent back to THIS support page on www.ads-software.com.

The calendar is broken after December 2021; if you try to view January 2022 a critical website error gets kicked. This is a heavily used calendar and we need to figure out what to do about this. The calendar is behind a members-only login, so I cannot share the URL here but if someone can reach out with a means of private support I can share login.

Any help would be greatly appreciated!