Hmm, I’m able to open them okay. I would recommend checking if Anki if up to date and re-downloading the decks and if you’re still having problems, you can email me and I can put my IT skills to work :D (I used to work at a computer help desk.)
Hey Francisco, welcome to TextFugu! I’d say good luck learning Japanese, but it looks like you’re quite good with a few languages already, so I’m sure it won’t be a problem :p