If you are using photoshop for a while, you just have gone from Photoshop 2020 to Photoshop 2021. but if you are using Photoshop for a really long time, like me, you may even go back to Photoshop 2015. Or even CS6, who knows… Here is the thing, each time that you update, photoshop keeps a copy of many of your options, settings, brushes, presets, and many more. Adobe is clever to not purge those folders when you update. Who knows, maybe a bug will force you to revert… But, apparently, you can definitely throw away the older version and save quite a bit of space. (The same can be said for space-saving with Lightroom, I guess Adobe does not care about space when they push an update)
Two words of warning though:
On windows
On Mac
For my laptop, I saved about a gig of data from photoshop alone. How much did you save?
