The Activate & Unlock doesn't show up when I open Hitfilm 4 Express. Any help or advice to fix this?
If you have just downloaded and installed HF4E for the first time, FXHOME is no longer issuing serial numbers for that old, end of life, version of the software. May I suggest you try Hitfilm Express 2017?
If you are reinstalling a prior download, from the File Menu click the Properties button then go to the Activation tab. From there you can manually activate. Your old serial can be accessed by visiting your Account page on this website.
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