The link that RyanH9876 posted is a GREAT piece of software. To boot, the author of it is very responsive if asked questions on GitHub. He has made changes twice for me in the past two months and is open to suggestions. It's certainly not perfect, but it's like 90% there. I've been less than impressed with Line6 for their seeming lack of support for the MKII. If they're not willing to improve the product, maybe they should just shell out to have this guy write their programs!
FWIW, until I can get my hands on a dedicated MIDI footswitch like the Morningstar or similar and am able to benefit from 128 presets, I am simply opening up the program's config file with Windows Notepad, copying the string for any presets that I plan to reuse and pasting it into a spreadsheet should I want to reuse it (which happens often for me). Then, simply copy-paste that string back into the config, save it, and boot the MKII editor. When the pedal is plugged in, it automatically syncs to the presets in the editor. All you need to do at this point in click-and-hold the respective switch on the MKII and it's saved.