And it seems that with the exception of hard core professional photogs that use a lot of tools that come in Photoshop, the main reason people keep subscribing/renting it is because of Adobe Camera Raw, which Adobe makes sure will only work up to a certain version of Photoshop (ie 6.7 with CS5, 9.1 with CS6. IMO, Adobe *could* have but didn't make ACR usable with other versions, and not for the reasons they claimed.)
There are ways around getting stuck with renting Adobe Photoshop or Lightroom, and to keep using your older version of Photoshop.
1: Don't fall for the often misunderstood phrase "No Longer Supported" if you update your computer's OS. All that means is you will have to make GOOGLE search your friend if you have a problem using CS5 with Windows 10. Or ask a tech savvy friend. If that tech savvy friend says "Subscribe to Abobe" they aren't as tech savvy as they claim.
2: Use the Adobe DNG converter. This will take your proprietary raw files and turn them into 'open source' digital negatives. I've done this when I had CS5 and got new camera. Guess what? Exact same result editing the DNG in CS5 as I got when I edited Canon's proprietary CR2 and Olympus' ORF file in CS6.
3: Find a different program to use as your camera raw editor. Yes, people keep chanting "Adobe is the industry standard", not realizing or caring that it was Adobe company itself that branded itself the industry standard. There are many other camera raw editors you can use, and then 'punt' the resulting JPG into whatever 'old' version of Photoshop you have. I do suggest, do you due diligence when looking for raw editor. There are many that are way over priced for what they do. A few are so slow and clunky.
My PERSONAL experiences are thus so far, in no particular order:
1: CaptureOne - no denying it is a great photo editor, but for the average hobbyist, or learning photographer, it's way over loaded in features. It is also THE most expensive editing program out there. Their 2020 version runs at $515.00 AUD for a single user license, or $35AUD to 'rent' it.
2: DxO Labs - Their latest version is fantastic. I have nothing negative to say about it. It has the best lens correction catalog, and if your particular camera/lens combo isn't on your hard drive, DxO will search and have it available for download if possible. It has not only adjustment brushes/gradients, but it also incorporates the U-Point tech of Nik. DxO has solved issues with certain photos for me. Definitely not overpriced for everything you get. Currently, you can get it for $ 189, no subscription.
3:On1PhotoRaw - Camera raw editor on steroids is how I described it to a friend. Not only do you get everything that is in the latest version of Adobe Camera Raw, it comes with tools found in Photoshop, too. You can use On1 as a standalone editor, not just as RAW editor, or as a plug in for Photoshop (caveat being if you can open the raw image in Photoshop). Pricing varies to $99 to buy it, or an extra $50 to subscribe to On1Plus. On1Plus isn't software, it's priority support, webinars, workshops, and other goodies thrown into the mix. It does have a few shortfalls (they removed Focal Point (creating a focus region bokeh effect), which is what keeps me running Windows 7 on another hdd (dual boot system) because I have their older software on that computer, which does have Focal Point.
4: Exposure X5 (the software previously known as Alienskin Exposure) - This is a great all-in-one camera raw editor. And if it had come out with this prior to my deciding to use On1, it would have given On1 a run for my money. It has many of the same tools, features and functions as On1, but it also has some that are no longer available in On1 (creating a focal point/region focus). I've also found it less of a system resource hog than On1. I have been getting reacquainted with how to use Exposure. Yeah, it's that good. Pricing varies (I suggest if you can, get the bundle. Well worth the $149)
There are others, Affinity (great software for it's pricing). I've imported finished JPGs into Affinity to use some of the features and tools they have, that none of the others do.
Skylum Luminar, Windows version: earlier versions work better than their latest release. If you have 2018, stick with it. I swear it was as if they released buggy beta versions on the general public. I typically use it only as a plug in for Photoshop because of this.
So, there it is. And remember, this is just my opinion and experiences. Depending on your computer, your experiences may be different.