A year ago, Google announced a change to their Batch Endpoint URL Batch enpoints are used by any application that wants to update a number of records in a Google API. One can hardly have an efficient Google Sync if you do not use the batch endpoints.
The announcement states that the old endpoints will cease working on March 25, 2019.
Free update for CompanionLink Customers: CompanionLink Customers with software purchased after January 1, 2014 (a five year period) will get a free update for their software. Purchases from 2014 through 2016 can update CompanionLink 7. Purchases from 2016 through 2018 are current with CompanionLink 8. Please download your update from our updates page.
$29.95 update for customers using Competing Products: CompanionLink extends our upgrade pricing to competitive products. Upgrade to CompanionLink 8 like you are one of our family. The upgrade price for CompanionLink for Google is $39.95 and we offer a $10 discount. Click here to purchase it for $29.95. You can also purchase CompanionLink for Outlook for the same price, which offers direct support for sync from Outlook to Android/iPhone using USB, Wi-Fi or DejaCloud sync.