Redshift for Blender is not as widely known, because it is still in beta (admittedly it's quite far along, though). So the installer recognizes existing Blender installations, but you can't actively install the plugin with the installer. You need to copy some folders and files manually as described in the Redshift forum Blender thread here.
I have mixed feelings about this announcement. At work, we have a C4D+RS subscription, but we also needed extra licenses for Maya and 3DS Max. The fact that our C4D subscription will now include Redshift for all DCC apps makes things easier, as everything can now be handled through our floating C4D licenses.
At home, I use Redshift as a hobby, so I am not particularly happy about the change. I appreciate the move to the MyMaxon account, though. I often work on my desktop machine and on my laptop. I move C4D licenses between the two all the time, and it's a breeze with the MyMaxon account. With Redshift, I do this less often, as it requires more (easy enough) steps. Having this more streamlined like Cinema is a nice little QOL improvement.
One thing we always don't consider though, is that technically, you cannot own a software. You only get a license for using it, so from a legal POV, perpetual vs. subscription is theoretically only about how long you are permitted to use the software (infinite vs. time limited). I know this doesn't really help, but I find it an interesting thing to remind myself about nonetheless every now and then.
What's unclear to me is whether I can still extend my maintenance after August 31st. I know you can extend it all the way up to August 2024 as the very final date, but I don't understand if you have to do this beforehand or if you can still extend maintenance after the switch. I am also worried what all this is going to mean for R25 perpetual in September...