Developers like josuedanielbust and coolsasindu provide free, transparent PHP-based POS code that you can audit before use.
If you proceed with an official installer or source code, the setup typically follows these steps: Download File Simple POS v4.1.1.rar
Instead of third-party rar files, consider these established versions of "Simple POS": Download File Simple POS v4.1.1.rar