I have tried v2.4 (trial) and realy incoprorate those functions I need. At moment I have a regular version of 2.3 which simply does not work any more after testing v2.4(after re-installation).
What do you propose?
Two versions cannot coexist at the same time installed in different folders. To downgrade to v2.3 you should uninstall all installed copies and then install v2.4. To upgrade to v2.4 it can be installed over v2.3 in the same folder.