(1) Explain your problem, don't simply post "This isn't working". What were you doing when you faced the problem? What have you tried to resolve - did you look for a solution using "Search" ? Has it happened just once or several times?
(2) It's also good to get feedback when a solution is found, return to the original post to explain how it was resolved so that more people can also use the results.
you can run 2 different versions they just have to be installed in different locations. One icon or shortcut points to version
P6 v21.12 database and the other icon or shortcut points to the P6 v22 database.