How to Fix 'Access Denied' Errors When Running pip install on Windows

Windows users running pip install can encounter an 'Access Denied' error, particularly when installing packages like mitmproxy that include binary .pyd extensions. The issue typically stems from insufficient permissions on the Windows temporary directory, where pip attempts to unpack and compile dependencies. Using python -m pip instead of pip directly ensures the installation runs under the correct Python interpreter context, avoiding permission conflicts. Clearing leftover temporary folders and using the --no-cache-dir flag can further resolve blocked or corrupted files. Experts also recommend avoiding administrator-level installs for the final step, as this can create system-restricted files that a normal user account cannot access.