Mine is stored in
C:\Documents and Settings\USERNAME\Application Data\Radmin\radmin.rpb
(Should be in a similar location depending on your windows install)/
Only $49 per lifetime license
for 50 PCs - $29.8 per remote PC
for 100 PCs - $24.9 per remote PC
for 150 PCs - $23.3 per remote PC
from 200 PCs - $22 per remote PC