Legacy agent troubleshooting steps

Hi,

We are using below legacy agents and looking for troubleshooting, reinstallation document on Windows 2008. Kindly share if any references.

5.8.65.0
6.7.1509.0
6.8.3168.0
6.9.10608.5
6.9.7322.3
6.9.10608.5
7.1.20069.1

Thanks \Siva