CS6 Sign in Error with Adobe Acrobat
Starting yesterday when I tried to open a PDF Acrobat gave me this message:

For at least a year my Acrobat has been requiring me to log in and enter my serial number in order to use Adobe Acrobat. I had tried re-installing it, that didn't fix it, but I didn't mind logging in and plugging in the serial number each time, because I use the software infrequently. Last week it started doing a QR code. Which I thought was strange, but whatever. But now it just says this. I have the latest version of Chrome, and I'm on Windows 10
