Use the EmClient backup feature in the old pc and then move the bckup file to the new pc and then restore.
It is best to be using the same major version of EmClient in both pc’s
Menu - File - Backup. in old pc notice where the file goes
Install Emclient on new pc
Move the backup file to new pc
Menu - File - Restore point to the file you just moved
Note restore does not restore any Tailored themes in Version 7
Location of older releases if you need it