ImaginAction is a software conceived for experienced Java users. They know how to run a Java application ;-) . However, problems may arise with non-standard configurations.

Windows 95/98/NT
Simply double click on the file ImaginAction.jar (the open command of jar files should be associated to the javaw program)

Otherwise
Write in the command line javaw -cp ImaginAction.jar it.uno.imact.Main
or simply javaw -jar ImaginAction.jar.