Did you even read the short paragraph I linked?
Your emulator not being up to date has absolutely nothing to do with it. You don't need to download a new emulator or any of that...
Please go back to the link I posted and read it.
Wrong. The readme in the actual hack-file told me that past versions of SNESX9 wouldn't work with the game, so in fact it COULD have something to do with it.
And yeah, I did read the link, which mentioned that either the rom I'm using doesn't have a/the correct header or it's corrupted, and that might be why it doesn't work, but again: the readme says that not all versions of SnesX9 are compatible. Please don't act like someone doesn't have their facts straight if you yourself do not.