we have purchased the em client pro version but my emclient free version is downloaded in laptop and the mails are stopped then how i will get the link for payment option how i will start with the pro version what about the email backup ? Please help

The Free and Pro License versions are the same application. So once you have the Pro License activation key, go to Menu > Help > License and deactivate the Free License. Then click on Activate and enter the Pro License key.

The link for purchasing the Pro License is

You can backup eM Client by going to Menu > File > Backup. You can also schedule automatic backups in Menu > Tools > Settings > General > Backup. The automatic backups will run even when eM Client is closed.