You may need to look for a link that says "Previous Versions," "Old Installers," or "Archives."
The installer usually contains both 32-bit and 64-bit versions. When you run the installer, it will detect your Windows 7 system. If you specifically want the 64-bit version, you must ensure you select it during the installation wizard (covered below). fl studio 12 download for windows 7 64 bit
Use your Image-Line account or buy a license (cheapest: Fruity Edition ~$99). A license for FL 12 works for all later versions anyway. You may need to look for a link