If you install it in each user profile seperately, then they will each have their own library, they won't have to share. but I don't think you can have it running in two user profiles at the same time on the same computer.

@ kikig,
You won't have to pay again. You just copy and paste the application file to each profile or you can redownload as many times as you like as long as your 6 months hasn't run out.

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If it ain't broke, fix it till it is!