Hi John, you have to go the the Meridian software site see link at the bottom of this page. Once there download and run the Meridian Universial Installer.
This installer will then let you download the legacy software configuration tool that you require.

Note: You will also need a RS232 NULL Modem cable to connect your PC/Laptop to the your 861v2. Have a look in the WiKi [top of this page] for more information on this.

Regards,
Carl

861v6+ID40, HD621, 8000.2, 7200HC, 7200.2, SKYQ Silver, PS3, PDP-LX6090, QNAP TS870-Pro (8*6TB), Roon, iPadAir2.
[In Reserve] C15, MD600 (2*3TB), TwinStore RM (2*2TB)