We really need to pin the answers for these questions somehow, maybe in the starting post.
what you are seeng is a japanese unzip dialog, it's complaining that it cannot find the split folder half in part2. this is because part 1 is a Zip>folder, part 2 is Zip>Rar>folder
what you need to do is unzip part2 and it'll give you a part2.rar archive, then unzip part 1 and click the "browse" button, switch to "all files" and select the unzipped part2.rar, then click OK and it should extract correctly.
right now you can;t extract both halfs of the folder separately because the file "project.json" gets split between both archives, so they need to be able to find eachother as described above.