All you need is an SD Card to put TvC's wad onto and to press and hold both the SEL and SET buttons before powering it on, and it'll install TvC onto the system. I did this myself and it all works great!
Although just in case, I ran the RVADumper beforehand to have a clean nand dump in case I needed it.
This wiki helps too.
https://wiki.arcadeotaku.com/w/Tatsunoko_Vs_Capcom_:_Cross_Generation_of_Heroes#SD_Card_Slot
As for the game, I don't think you can share links due to copyright n stuff. But if dm's are okay, I can help you as I still have the link to where I got it from.
EDIT: Also, I don't think ANY SD Card will work, I think it has to be one that is just the old original SD format, no SDHC, XC or anything like that, so any SD Card that is at max 2GB. But I could be wrong on that.