I have realized that I need to do more than 5 returns so I bought another Turbo Tax Deluxe. Can I install it on the same computer as my last Turbot Tax Deluxe?
No, you cannot, but it wouldn't help anyway. You can prepare and file on paper as many returns as you want. The restriction is on e-filing. It's an IRS restriction and cannot be avoided by adding a second program to your computer.