You can go linux, you can go open-office. I wouldn't pay someone to download and install them, it's not hard, doesn't take much data.
I prefer the simpilicity of a boring free text editor like q10.
You'll want to download wikipedia (its not so big if you just download the text, people will sell you dvd's of it if you want).
Operating systems like windows sometimes try to force you to update by tinkering with your update settings, but will still work fine if kept offline.
Windows lets you use Win 10 without a license permanently with almost no downsides (tiny watermark) - it's great if you need the latest OS.
Laptop and phone batteries aren't made to fail at a set time, they are prone to failure because they are dense, cheap, highly used power sources.
I've got a few 15 year old laptops still going in everyday use (often running for weeks non-stop), though the batteries didn't last long.
How long computer parts last is mostly luck-of-the-draw, I've had PC's last decades without repairs.
Alternatively, buy a $10 bluetooth keyboard, put openoffice on your phone or tablet and use that as your main computer. You can get an adapter to plug USB drive to phone for $3, you can get an adapter to output phone to your tv for $4.
Put wikipedia on a USB drive for when you need it.
There are very few things that can't be done on an android phone or tablet.