Once you’ve downloaded 7zip, install it. You probably need to restart your pc afterwards. Then, go to the textures file, right-click > 7zip > Extract here.
I’m actually surprised you don’t have it or a similar program to unzip files in your pc, it’s a popular format that’s used for file sharing. By zipping it, you can decrease the file’s size and you’re able to upload an entire folder in one single file. Basically, it creates a package.
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