cURL is a very commonly used program to download individual files from the command line and worth installing to have it around in the future.

sudo apt update
sudo apt install curl

The first command tells your package manager to update its list so you ask for the latest version. You can skip it if you've already updated today. The second command tells your package manager to install cURL.

This will happen every now and then, especially when building a package from source. You won't have some common utility that the documentation writer assumed you had, and you will need to find what package provides it and install the package.

The way to solve that problem is to read the commands and look up what they do. The installation method they describe is pretty standard and inoffensive. And provides automatic updates. The commands used aren't complicated and they're some of the system fundamentals for Debian/Ubuntu systems so it's a good idea being familiar with them.

Yes people would assume you have curl. Curl is often used to install programs. And curl is definitely one of the things that can do malicius things this way. So you are right to be hesitant to use commands that you don't understand. Most Linux users have forgotten how hard it is to learn the first stuff with no preaquired knowledge.

If you have googled "what is curl and how is it used" you may have found some relevant info.

I have given up on Linux because installing was hard in the past

There are some tools that make installing software easier. Like "appimage" files that are single files that (after you make executable) are completely self contained.

Flatpacks and snaps have an "store" like experience.

.deb files are also sometimes simple (also need to be made executable) (depends on the distro)

Unfortunately there is no .exe file experience.

In the time it took you to write this shit post and respond to all the comments you could have spent a couple of minutes reading and educating yourself on the process. It’s legit pretty simple especially if you’re willing to do a little research.

Kids these days i swear.

Doesn't sound like this sailor is much into reading

"follow an installation wizard" <-- I know people just out of uni (having completed BTech), who can't even do that. Keeping that in mind, I can have way more patience towards OP.