Hi Aaron,
Thanks for contacting Syncfusion support.
You can use the v16.4.0.* license key in your application to register for v16.4.0.54 and v16.4.0.54 is a weekly NuGet publish release version. We are currently listing out the Syncfusion public release versions in our website for license key generation. We already logged this as a feature to include the weekly NuGet release version in the license key generation dropdown.
Our license key works with version specific. During the license validation, the build number (Last digit, either 42, 44, 46, 47, 48, 42, 53, or 54) will not consider. So, any 16.4.0.* license key will work for v16.4.0.42, v16.4.0.52, and v16.4.0.54.
Please refer the following Knowledge Base article link for more information.
Regards,
Vadivel Natarajan