Still working on it. 20 minutes more, as I am performing this upgrade myself on a sandbox server.
When complete, I'll update the main archive in the Member Area. If you had already uploaded all the other files to your server, the only file thats been changed which is preventing you from continuing is install/UPGRADE_CHANGES.txt. When complete, you'll notice the date of the file in the installer archive to be the only one in the install/ directory with a more recent date than the rest.
Tested an upgrade of 7.5.9 -> 7.7.0 using the a fixed /install/UPGRADE_CHANGES.txt file.
The upgrade is working as expected. I did not run in to any issues after fixing the reported issues. Thank you Slaz!
An updated install package has been posted.
As a reminder:
the only file thats been changed which is preventing you from continuing is install/UPGRADE_CHANGES.txt ... you'll notice the date of the file in the installer archive to be the only one in the install/ directory with a more recent date than the rest.
