Depending on which file you downloaded, the installation process differs.
For users wanting to run Android 7.1.2 on a PC or virtual machine, the Android-x86 project provides ISO and zip files. Internet Archive - Android x86/x64 7.1 Nougat 3. Custom ROMs (LineageOS & AOSP) android 712 download zip file link
Update packages that can be flashed without wiping data. Google OTA Images Page Depending on which file you downloaded, the installation
Click the link; your browser will usually prompt you to choose a save location, such as your "Downloads" folder. Google Help Custom ROMs (LineageOS & AOSP) Update packages that
While Android 7.1.2 was revolutionary in its time, it is now considered an "End of Life" (EoL) operating system. Official security updates ceased in . Risks of using 7.1.2 today: Android 7 Nougat | Specs, reviews and EoL info - InvGate
Google provides official factory images for Pixel and Nexus devices. These are full system images in .tgz format (which contain the flashable ZIP inside).
), you can download the official factory images directly from the Google Developers Image Archive .