Fortunate position
Fortunately, for me, I am in a position that I no longer need to upgrade my computer O/S. And when the apps no longer work I will just delete them. I was able just to squeeze into High Sierra but I think that is the last O/S that I will be able to install. It is such a shame though that my model is not upgradable, I was unaware of this when I purchased it. I would like to be able to purchase parts and upgrade rather than have to sell my first born to get the newest computer. Getting older does have its benefits.