Here is what I found after analyzing the link:
Because Bitly could not retrieve the content of the destination, the actual contents of the windows10.txt file remain unknown. The security scan did find any active threats, but it also could not confirm what the text file contains.
The Bitly link bit.ly/windows10txt redirects to another address: get.msguides.com/windows10.txt . However, the security check from Bitly explicitly states:
on the information from the link you provided, I cannot draft the informative story you requested about bit.ly/windows10txt .