Windows 10 upgrades will cost $119 after this Friday

Even if you don’t necessarily want it right now, my recommendation:

Go grab a free disk imaging program. Macrium Reflect Free is one. Image your current boot drive. Then install Windows 10. Get that working, then image that. You now have the 10 upgrade in the can. Save a copy somewhere safe. Reinstall your old boot image. Keep using that until you actually want to move to 10, then restore that.