I have D7 and XE2, both on the same system (Win 10), and installed Berlin Starter Edition. After the issue with the BOM has dissolved into nothing I don't see any major conflicts of the Berlin Edition with the already present installations. Of course, loading and editing an old - say - D7 project by the new version will probably add new properties to the form, and most likely you will not be able to load the same form back into D7 - always make a backup copy of existing projects before loading them into newer versions. And I should also note that as usual the last installation grabs ownership the the pas extension, i.e. a pas file double-clicked in the explorer is opened by the Berlin Edition - this is usually not desired since it is more restricted compared to the already existing pro versions. I can't remember if there was an option during installtion to keep the old file associations.