Yes, you can install any plug-in on as many computer as you want, but the number of computers running concurrently is equal to the number of licenses purchased.
For example, if you purchase one license, then only one computer can use the plug-in. To use the plug-in on other computer, just click the Transfer button on the License Manger of the licensed computer, then click the Activate button, on the License Manager, of the computer you want to operate. Note: There is no need to close Illustrator after clicking the Transfer button. Transfer operation requires that your computer be connected to the internet, since the license is transferred to our secure server.
In order for multiple computers to use our software concurrently, you need to purchase multiple licenses. You can do this by adding to the shopping cart, the same product, multiple times before checkout. After purchased, we will send you an email with a product key that can be used to activate multiple computers. Discount is available for purchases of licenses greater than 2.