The plugin is compatible from PHP 7.4.
In the 1.x we changed the table name of entities. If you have a running instance of the plugin you can run this SQL to rename the tables :
RENAME TABLE `mbiz_homepage_homepage` TO `monsieurbiz_homepage_homepage`;
RENAME TABLE `mbiz_homepage_homepage_channels` TO `monsieurbiz_cms_page_translation`;
RENAME TABLE `mbiz_homepage_homepage_translation` TO `monsieurbiz_homepage_homepage_translation`;
You can generate a blank migration to run these requests properly. See generating blank migration in doctrine documentation.
We upgraded also the Rich Editor to the 2.0 version.