I have been using Magix Movie Edit Pro Plus (current version 18.0.3.261 (UPD3)) for more than 3 years. Until now, I have been able to import MP4-files to the timeline and edit them. But now the program says that I need the MPEG-4-Codec, and asks if I would like to activate it for free. When I click the "Activate online" button, another window says that activation failed, and I would have to do activation as admin. I try it again as admin, but it fails again and asks me to do it as admin.
Then I try to activate the codec from the menu: Install added content / MPEG-4-Codec MainConcept (my program is in Finnish, so I'm not sure if my translations match the English version). When I try to install it, a new window says that I have to pay for the activation. It also says that if I've previously had it activated, changes to my computer may have de-activated the codec, and gives me an opportunity to reactivate it by using the same order number than before.
I have no memory if I have activated the codec before or not. I went through my emails from 3 years ago, and I couldn't find an email with codec activation. So I really don't know whether I had it activated or not. All I know is that a week ago I could use MP4s and now I can't.
I noticed this problem today when I tried to edit an MP4 which was captured from another computer (a clip from my sons Minecraft-game). When that failed, I tried MP4s from various other sources (clips from my Panasonic camcorder, youtube downloads etc), and none of then worked anymore. I was wondering could that Minecraft-clip (which was captured using Xbox/Windows game bar) from another computer somehow confused MEP or changed the settings of the program, so that it now requires the Mainconcept codec? But then again, I'm not sure if I ever even had it...
I haven't made any changes to my computers components (Windows 10, 64-bit, version 2004 / Intel i7-7700K / 16 Gt RAM / GeForce GTX 1060 6GB). Only recent software changes have been Windows updates. Although I have had some issues with my antivirus software (F-Secure).
What do I have to do to be able to edit MP4s again?