Looking for WP Bakery plug in long time updates solution

We recently purchased a few themes that have come with wp Bakery plug in. These now have updates and when trying to update the plugin, it states a new plugin needs to be purchased. After researching the plugin, I found a few solutions, the advise I found has not worked out. Plus I would like a long-term solution as the plugin will continue to need to be updated throughout the years. Please advise