Thank you so much, I'll take a look!@KimWilson , G'day and welcome to linux.org
You won't be the first, nor will you be the last, to think that you can install Linux that way, so it is an understandable mistake.
But if I were to dissect your procedure above, I would answer it with "Nope" about 7 times over.
Linux cannot be installed that way. The .iso has to be "burned" to USB or DVD, just as you might use a burning solution to capture music.
Rufus, mentioned above by Pete, is one such burning solution, another is Balena Etcher, which is very user-friendly.
Brian, @Condobloke , whom you have seen above, with the beautiful dog Belle that might like to play with your cat, has a good article in our Linux Mint section, and @PhilippinPete can take note too.
It is at https://linux.org/threads/how-to-try-linux-mint-on-your-windows-pc.20993/
Brian's thread, broadly speaking, can be applied to many more Linux Distros than just Linux Mint.
Kim if you have further questions after reading Brian's material, start you own Thread either in Mint or in Getting Started, mention you've read Brian's Thread, and someone will be along to help.
Saturday here in Oz, so to all
Avagudweegend and stay safe
Cool! Thank you so much!If you did happen to 'break' it in usb (live) mode, then to fix it you would just reboot and start again. Simple !
After you have installed properly, and you happened to 'break' it.....you will find an app called Timehsift in the Software Manager....Once it is setup it will save snapshots to an external drive, and these can be restored in the case of a failure or break etc. Again...Simple.