Hi Prem,
as wM 7.1, 8.2, 9.0 and all versions before and between these are already complete out of support and wM 9.5 SP1 is in Extended Maintenance Phase it is recommend to focus on the current releases from 9.5 SP1 onwards.
Exceptions are certain WmART based Adapters which are still supported even on newer versions of wM as there is not yet a 9.x version of them.
See Adapters System Requirements Guide for details.
Please note that the last version of Broker is 9.6 which is still supported on all versions of wM 9.6 and newer.
Regards,
Holger