- Changed default directory parameter from hardcoded ${HOME}\Downloads to null
- Added Get_Downloads_Dir function to read actual downloads folder from Windows registry
- Modified Set_Install_Dir to auto-detect downloads directory or use current directory
- Updated help text to reflect new default behavior (current directory)
- Removed unused $default_install_dir variable
Co-authored-by: ccmywish <63459097+ccmywish@users.noreply.github.com>