To give you a for your project, please let me know: What is inside the file once extracted?
Look for README.md , README.txt , or instructions.txt . Read this first for specific project setup instructions.
You must have 7-Zip installed to open .7z files. Windows: Download 7-Zip for Windows . macOS: Use Keka or p7zip via Homebrew ( brew install p7zip ).
If extraction fails, download the .7z file again, as it may be corrupted.