It would help if you took a screenshot of the About version screen.
PD15 is no longer supported, so you won't be able to upgrade from something like the LE version to the full version of PD15. The only produce currently sold by Cyberlink is PD18/365.
You may be able to find older versions from other sellers on eBay or Amazon, but be aware that versions older than PD16 won't be able to use nVidia GPUs for producing unless you use an older driver, though.
YouTube/optodata
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