You cannot install Fire OS as a primary OS on a PC, but you can run the inside an emulator.

Since a direct Fire OS ISO for PC does not exist, the best way to get a similar experience on a laptop or desktop is to use a modern Android emulator or an Android-x86 ISO. How to Install Android in VirtualBox

If you own an actual Fire Tablet, you can extract the system firmware (a .bin or .img file, not an ISO) to back up or restore your device. This is useful for installing custom recoveries (like TWRP) or debloating Amazon software.