We will take part in Atlassian's Dual Licensing program once it's available to help users avoid double costs. Until then, please reach out to our support at firstname.lastname@example.org to figure out an individual solution.
We do not have any plans to discontinue maintenance or support for our Data Center apps.
Scroll Versions in its current form can not be ported for Confluence Cloud due to how deeply Scroll Versions integrates with Confluence Server. Instead, we envision Scroll Documents to become the new solution for versioning and technical communication on Confluence Cloud.
Scroll Translations in its current form will not be released for Confluence Cloud due to how deeply it integrates with Confluence Server. Similar to our plans with Scroll Versions, we envision Scroll Documents to become the new solution technical communication on Confluence Cloud – including language management. We do not have any specifics on when this is going to be added, but we're doing our best to let you know.
Custom theme support is definitely on the road map for Scroll Viewport for Confluence Cloud. Right now we can't give you any details about what custom theme support in Scroll Viewport for Confluence Cloud will look like and when this feature will be available.