The standard 1.64 software download is
here
The new 3.1 software is
here
When you install it (as Pete says) 508_NoTiming is for blinky mode, and other versions can do timing.
The 3.1 software can run with all versions of speedos including the new V3 controllers, whilst the 1.64 software will run on speed controllers up to 2.1
Any questions, please shout
Thanks
Chris