As per its official site TiMidity++ was last updated way back in 2004. An updated (patched?) version seems to have been released in 2012 (not by the original author), but you might be hard pressed to find a Windows binary for it (especially an x64 version).
Instead I'd advise you to use either VirtualMIDISynth or the BASSMIDI MIDI Synthesizer Driver (open source), both of which depend on the BASS/BASSMIDI audio libraries:
Once you have either driver installed (here's a handy detailed tutorial for both) you can:
Select it as the default MIDI device in your MIDI player of choice
Select it as the default MIDI Out device under Windows so you can use it with all MIDI players, even the ones that don't offer a MIDI device selection option as shown above
Note: Vista+ removed the Control Panel option to select the default Windows MIDI Out device, so one is normally stuck with the default (and extremely limited) Microsoft GS Wavetable Synth. You can use either the drivers' own configuration utilities as shown above, or standalone utilities such as Vista MIDI Picker, Putzlowitsch's Vista MIDI Mapper Control Panel, Vista MIDI Fix, MIDI Out Setter (open source) etc.
