You opened it recently because TPS turned off their AES encryption, so nearly everyone could view.
Now we know why, they have been tweaking their encryption to stop unauthorised AU.
There were still a couple of receivers managing to open it and software seems to be surfacing for a few other receivers.
If a new patch becomes available, for your receiver, then installing it will be the only way you can get it back, apart from buying a new receiver, a cam, if any of them produce any working files, or a subscription.