Each Amiga model shipped with a different version of Kickstart. For emulation, you need to match the ROM to the Amiga model you want to simulate:
: This is the most popular legal source. The Amiga Forever Essentials app for Android provides a low-cost ($1.99) way to get Kickstart 1.3 and 3.1 files. Once installed, the ROM files can be transferred from your phone to a PC. kickstart rom amiga install download
Getting Started with Amiga Emulation: Kickstart ROMs Explained Each Amiga model shipped with a different version