It's not annoying or anything, but just weird. Every time I install older generation software on my computer I get Lightroom yelling at me that there is not any space left on the C: drive. Now when you consider my C drive is 1.81 TiB, this is a little odd. Any ideas as to what would be causing this?

I've taken the habit of just leaving Lightroom closed when installing software at the moment. Which prevents the annoying issue, but I like to do stuff while I'm installing a 20GB game, so any ideas will be appreciated.