One Business License(2 sites License/Staging+Production) can be activated on 2 Moodle™ software/WordPress sites. It could be 2 Staging (Test) or 2 Production (Live) or a Combination of Staging + Production site [Recommended]

With an Annual License, you get access to Product support and updates for 1 Year. After the License expiry, you need to renew your license to continue getting Product Support and Updates. 
Note: If the purchase is made from our website then you are subscribed to auto-renewal when you purchase Annual License. You can always opt to cancel auto-renewal by canceling the subscription from your PayPal account.

With a Lifetime License, you get access to product support and updates for Lifetime. And you do not have to renew the subscription every year.
Note: The number of licenses/sites on which the product can be activated does not change depending on the License type (Annual/Lifetime)

The activation count is reached most of the time when you take down the site/uninstall Moodle/WordPress without deactivating the License keys. To reset the activations, navigate to My Account page > Click on the Key Icon > Manage sites > Here you will find the option to reset the activations.

Any Business License(2 sites/Staging+Production license) can be used to activate the license on Staging/Test Site and Production/Live Site i.e the same unique license key can be used on both the instances.

Firstly, you have to choose the plan from the pricing table and then click on Buy Now. Now when you are on the Checkout page, you will find the option to choose between 1 Business, 5 Business, and 10 Business License.

Yes, you can always deactivate the license key and reuse the license key on a new instance.