Can someone port the Super Mario Mash-Up Pack to the PC?
I would like to play with it, and it's not on the windows 10 version.
No. Packs sold on Bedrock are locked to the versions of Mnecraft they were released on. In this case, someone would need permission from Mojang, Microsoft, and Nintendo in order to be able to legally port the pack to a different system. Given that the interested parties themselves have not already done so, it is VERY unlikely that anyone would be given permission to do this.
I'm going to lock this thread to prevent anyone from "helping" by posting a copyright-infringing download of the pack here. Such a thing would violate the forum rules, so is not allowed here. I hope that you understand.