I am downloading it from the Paint.Net website (https://www.getpaint.net/download.html)
I just scanned my system and my windows 10 is all up to date
And I clicked the link for the Frame work and it said it was already installed on this laptop.
I've had paint.net before but haven't used it in a while, and recently when I was trying to open it this error came up, I uninstalled and reinstalled and it's still there. But something did go wrong with my laptop's hardware between that time so, I might just need to get a new one.