Leadercalc is provided free on www.globalflyfisher.com
As it is continuously updated and revised, it would seem to me that having it on disk would be superfluous (that big word means "perfuming the goat").
Just keep in mind - virtually all leaders, regardless of source, are based on the old formula from A.J.McClane's book that calls out 60% butt, 20% step-down and 20% tippet. This is a formula that has stood the test of time, and works VERY well! Write it down or memorize it - you won't go wrong. How many reductions you use to accomplish this is your choice (But I've got it down to 3 or 4 total pieces, depending on overall length. I hate knots - they are always the weakest point of the connection!)