As the title asks, is it possible to have both Logos 5 and Logos 6 installed at the same time (without having multiple logins)?
This would allow someone to try out Logos 6. They could then (a) see if they like it enough to permanently switch, (b) use Logos 6 alongside version 5 until they become comfortable enough to use Logos 6 permanently, or (c) "rollback" to Logos 5 if they don't like Logos 6.