APPOINTMENTS + GCAL does not automatically sync

Hi there. I am having an issue with syncing back from Google Cal. I have read the post below and applied the patch but it is still not working unless I manually run the cron job.

I have also read the post below on how to modify the cron job frequency to 2 minutes but still no luck.

When I try to update your plugin, I get this error below.
"There seems to be something wrong with the WP Heartbeat API state. The "Pending Appointments count notification" add-on might not work properly because of this"
and "Download failed. cURL error 18: transfer closed with 2577992 bytes remaining to read"

Any help would be appreciated.