If you are to move only member email addresses, it can be done by downloading to Excel file and the copying the address column and uploading it. No need for any programs.
The best I can hope for is to capture the old messages, files and photos an place the in the Files and Photos sections of the new icom2kl group, but the members will not be transferred. There is a program "PGOffline" which will do this, but I have to buy the full version.