Then update your website to Joomla 4 from the menu System => Control panel => Maintenance
For users still having AcyMailing 5, although it should still work for Joomla 4, we strongly recommend to update to the latest AcyMailing version as your data can be migrated.
Move AcyMailing from a Joomla 3 website to a Joomla 4 website
If you need to move your data between two Joomla websites, you can follow these steps:
On the new website, replace the folder media/com_acym/ by the one of the origin website
6.
(optional) If you made some custom translations, you can find them in the language/ folder, so copy for example language/af-ZA/af-ZA.com_acym_custom.ini to the same location on the new website
Note that these steps also work when moving AcyMailing between two Joomla 3 or two Joomla 4 websites.
If you own a paid version of AcyMailing, you'll also need to:
1.
Click the "Unlink my license" button in the License tab of the old website
2.
Attach the license in the new website then activate the "Automated tasks" option