We offer free upgrades for major versions of Mautic and provide the next major version at half the regular price for updates.
When you buy the Mautic 4 plugin, you get free updates as long as Mautic is being updated. If you want to switch to Mautic 5, you can buy a compatible plugin at a 50% discount. Same, if you get the Mautic 5 version initially, you can buy the Mautic 4 version later at half the regular price.
Feel free to ask for more information if you need support. You can reach us at email@example.com.