You can upgrade from one license plan to the next one whenever you want simply by paying the cost difference. You only have to send us an email in which you specify the product that you have and the OrderID. We will give you an unique coupon for the upgrade.
For example: if you paid $49 for Material Dashboard PRO - Freelancer License and now you need the StartupLicense which is $149, you only need to pay $100.
Once you upgrade to the next plan, the availability of Support and Free Updates will be upgraded, as well. For example, if you go from Freelancer license to Company, you will get another 6 months of Free Updates and Tech Support.