I will get a VS Project in this is the LLBLGen Version 4 included.
Now I have to buy a Licence for LLBLGen.
Would the new Version 5 work in the VS Project without changes too or do I have to buy the Version 4?
v5 can load your llblgenproj project and generate code for it but it will be v5 generated code which might require you to migrate your own code a bit. Any person who buys v5 can get a free v4 or v3 license if they want, so if you buy v5 and want to continue working in v4, that's fine, we'll send you a v4 license free of charge in that case and you can download v4 from the website in that case.