Upgrading from OSX 10.8.5 to 10.13.6
I have an Early Macbook Pro 15 inch from Early 2011 that I need to use as a fallback. The os is 10.8.5 and obviously no longer supported. The browsers cant be upgraded without newer os so i cant use a lot of web applications on it that are critical for me.
on http://support.apple.com/en-us/HT201300 it says that the newest compatible os for my specific laptop is 10.13.6. Because I am on such older os, I dont see a path to upgrade. I have never purchased a newer OS either which seems like was a bridge for upgrading. The latest os in the app store under purchased shows as Mountain Lion (10.8).
what can I do to installed the latest support os 10.13 for my laptop?
thanks much!
MacBook Pro