There's probably a more rational method of locating it. You can find Seil by visiting clicking on Karabiner, and then clicking on "related apps." That's the way I found it just now, anyway. Only caveat is to always use the "select key" option to find the desired keys from a list, since the "type key" option will require mouse intervention to get out of the edit box.
Sharpkeys simply writes a key to the Windows registry, so it has always been very stable for me in many years of use on many machines. Then you sharp keys from to map PrintScreen to Insert (or caps lock, if you prefer). Look for a mac app named "Seil" and follow the directions-it's a little tricky, and involves first disabling the caps lock key in the System Preferences and then remapping the Capslock key in Seil to something neutral like Print Screen (which the mac thinks of as F13, since the key codes don't seem to match up between mac and Windows). Anyway, the names of the apps have changed since then. I could have sworn I got the original idea on appleVis a year or two ago.
The solution I learned was to install an app that does this.
Stop interacting with the toolbar and click on the keymap tab.Interact with the toolbar and click on keyboard and mouse button.Press command-comma to open preferences.
I can now tell you how to re-map one of the keys on your mac keyboard so it becomes an insert key. I have some good news if you want to use Windows on your mac using VMWare Fusion.