Adding Vault packages to a source build

I recently made a build of the engine using

Do I need to also have a non-modified version of the engine installed in order to use Vault packages? They won’t import currently it seems.

Theres a “Show all projects” button in the chooser dialog of the launcher if you add to a project that shows projects bound to non-launcher builds, and if you create a vault-template project you can right click it in the Explorer to change the used Engine for that project (thou I don’t know if it happily installs full projects from the vault without a launcher version of the Engine).