It is possible to start several different versions and instances of Visma Business on the same machine. All you have to do is to enter a substitute of the key CurrentVersion in registry.
The substitute key must contain the same three keys Database, International and Miscellaneous with all key entries.
If you have created a Version521 key you have to enter the following command line parameter: /nVersion521
There is no limit of how many substitutes of CurrentVersion you can have.