Shameless rant:
Last I checked, a roll of Kodak film costs $10.00 to $18.00 these days. That's without processing. If you use and process a roll every other month, that's about like paying for the least expensive Adobe Photography Plan.
A subscription to Photoshop, Lightroom, Lightroom Classic, and Bridge costs $10/month. It's some of the best software on the planet. Developers have worked hard on it continuously for decades! Of course they charge for it. They get to eat, too.
Why does half the world not understand that you get what you pay for? Why do people not understand that they NEVER BOUGHT software, they only LICENSED IT? It is intellectual property, just like music, books, photographic images, and formulas for patented drugs.
The computing world isn't like the tool world, where you can buy a hammer and use it for life, or until it breaks, whichever comes first. Computers, operating systems, and software evolve rapidly — more and more rapidly every year. When that old computer running Photoshop 4 dies, good luck finding a new one OR an old one that will run Ps 4. And good luck activating your license on the new machine...
HACKERS and malcontents develop dangerous malware more cleverly all the time, too. So the computer you bought a decade ago with Win 7 or MacOS 10.9 Mavericks on it is no longer safe on the Internet. Chances are, hackers have found security holes in all the Adobe software from that era, too.
It is a continual battle to keep up with security. The market life of a computer is around five years. The market life of an operating system is not much longer. Everything needs an update now and then, and an upgrade when updates are not enough.
If you want free software, download some open source stuff, like Dark Table. Good luck getting help, training, and support...
Alternatively, you can use the stuff that came on your computer, or that is a free download from Microsoft, Apple, or your camera manufacturer.
There. I feel better, now.