Where did you see that e-on charges for re-download?  I had to download a few times, never had a charge.  You can even have e-on reset your downloads if they expire.  Once you download I recommend you burn it to CD - then you have exactly the same CD as you would if you bought the boxed version (yes - Mac and PC).

Now AsileFX training DVDs - they do charge to re-download after the three day period...  Adobe - I refuse to buy downloaded software from them - lousy support.   

LVS - Where Learning is Fun!  
http://www.lvsonline.com/index.html