On 4/20/2017 Google changed the authorization standards for syncing. This change is not supported by Informant 4.94 and older.
Informant 4.94 cannot be updated as the iOS development tools for the application are no longer available.
There are two options for restoring syncing to Google.
1. You can upgrade to Informant 5 which is compatible with the new Google authorization and you will be able to restore syncing.
Or option 2
2. You can configure your device to sync to Google via the iOS calendar. Then you can have your device share that data with Informant.
This configuration moves the syncing from Informant to the device but still allows users to access their data with Informant.
If you decide to use this option before starting please go into the Informant settings, backup/restore and tap make backup now. Then go into the accounts area of the settings and remove the Google Sync account to avoid having your data appear to be duplicated.
With either method please feel free to contact support with any questions that you may have.