If you have a Platinum VIP license, you are entitled for a free update for jv16 PowerTools X (as well as to all future products and product versions).
To update, download the free trial version of the software (From here: https://www.macecraft.com/download/), install it. After the program starts, open its My Account feature and write your name and email address there. The My Account feature should automatically download and install your license. Please make sure you are using the same email address you used with your original order.
If the My Account feature doesn't find your license, you can also try to manually download your license from: https://www.macecraft.com/my-license/ The same page also lists all your previous orders. To manually download your license, click the correct Download button to download your license, save the license file to the installation directory of PowerTools (by default: C:\Program files (x86)\jv16 PowerTools X\). After doing that, use PowerTools X's My Account feature's "Install new license" button to open the license file.