Krasi69,
That all depends on what version your phone system needs to work off of.
The top executable, 6_0_11_84-DBP_Plugin-64bit.exe, is just a plugin and would need to be installed after the second one 6_3_84_0-SysAd_6_3_7_84-DBP-64bit.exe as it is the program that runs the plugin. This executable, 6_3_84_0-SysAd_6_3_7_84-DBP-64bit.exe, also has a plugin built into it that will ask if you want to install it.
So, if you don't need the plugin 6_3_7_84-DBP-64bit, then don't install that and then run the other plugin.
Thanks,
TE