You can install WB any number of times on your main computer, and the one you, say, travel with...i.e. your work (main) computer and your other one.
If you installed WB7 while being entitled to 6.x, then you're using trialware and it'll time out in 30 days. Best advice? Re-up your sub. You'll be able to plug those new numbers in and you're up and running and won't 'time-out" and won't have to go thru the rigamarole of uninstalling/reboot/reinstall/reboot. Also, I'd advise using Impulse.
On the other hand, if you don't wish to re=up your sub, you're still entitled to the last version around while your old sub was active. In that case write to stardock sales and get a link to that version.
Hope this helped.
