Definitely! You can use Asset CleanUp Pro for as long as you wish. If your license expires and you don’t renew it, either automatically (by default) or manually (if you have canceled the recurring subscription until the renewal date), you won’t be able to get the latest updates and support, but you can still use the plugin 100%. You don’t need to renew the license after 1 year, it can be later on whenever you need any support or new features. The renewal cost for an extra year comes with a 30% discount on the license price at that time. For instance, if you paid $39 for the license, the renewal would be just $27.3.
For your convenience, the license is automatically renewed after 1 year, unless you cancel the subscription.