Thank you for the clarification.
Unfortunately, we no longer sell/distribute version 6.10 license after version 7 release. Sorry for that.
However, please note that it's still possible to connect from Viewer version 7 to both Host/Agent version 6 and 7 and vice versa as we understand that not every user might be able to update their installation right away, so we try to maintain as much backwards compatibility as possible.
In addition, please note that you can also update Host on the Windows XP machine remotely via the Self-Update feature
- this will update your remote Host to the latest version (you only need to log on to the remote Host) and then restart it automatically, so you'd be able to connect right away and transfer the files without downgrading your Viewer.
Hope that helps.