At present if you get the direct download you have to write to an EPROM, install into your AMIGA and then write out and use the Kickstart floppy. Actually having the kit to do the programming, the correct EPROM chips and doing it right is a little more involved, from what I've read; I haven't touched an Amiga in some time myself.

The news post on Hyperion's website states that you'll be able to buy ROMs and floppy disks that have already had the updated code written to them "shortly".

There's going to be a physical version at some point, but summary:

1. Buy A500/A600 download version, or A1200 if you've got a Vampire accelboard.

2. Get adf into Amiga floppies by whatever means (serial cable, pcmcia nic adapter, flashfloppy-enabled floppy drive emulator)

3. Boot workbench disk or installer disk. ROM patches will be loaded by loadmodule @ startup-sequence.

4. (Optional) Flash into (E/EE)PROM chip or (more sane) into A500Flash1M or similar such rom switcher solution with a flashrom in it.

Note you'll want at least 2MB RAM total for this, at least 1MB of which being CHIP RAM. If you don't have this much, don't even bother.

And where could one get a compatible ROM flasher and WORM chips?

If you are looking for an affordable solution you can use this: https://gglabs.us/node/2038