For the first week only templates will be over 50% off!
Yes! Once you purchase, you get lifetime access to Bootstrap Email Templates. That means when new templates are update or added, you will have access.
Unlimited. As long as they are your projects, you can use the as many times as you want. That is the idea, no need to reinvent the wheel.
The usage license is the license that dictates what you can and can not do once you buy the templates. Here is a link to the Usage License.