Locate the zipped folder that you want to unzip (extract) files or folders from.
Do the following:
To unzip all the contents of the zipped folder, press and hold (or right-click) the folder, select Extract All, and then follow the instructions.

Unzipping a file on a mac computer is user-friendly and intuitive. To unzip files on a mac, simply follow the steps below:
1. Double click the zipped file.
2. The file will automatically be decompressed by Archive Utility into the same folder the compressed file is in.
3. Access the extracted files by clicking the appropriate icons.
(Alternatively, if the method above does not work, you can right-click on the .zip package, and select Open With > Archive Utility (default).)

Sorry and No.
When you place order I‘m suppose you have experience with files (and you must have experience with files), so I do not provide technical support. (This include: You don't know how to open file. You don't know how to use file. You don't konw how to cut the files. You don't know how to edit files etc)
But If you have problems (wrong files, files not completed) with your files kindly contact me.

Please read this help article
https://www.etsy.com/help/article/3949