OK, got some more info into the issue. Part of the problem is that I used my hosting company’s WordPress installation system, and it made an “easy” WordPress install, but it installed it into a subfolder, and created a domain pointer/redirect to that subfolder. That seems to be creating a domain-level rewrite that’s interfering with access to those subfolders.
The plot thickens…
Hi Leon,
To clarify your steps:
1. Download WordPress locally and unzip
2. In your local folder, delete “wp-content” folder
3. Upload remainder of local files onto your WordPress servicer via FTP to REPLACE all existing folders and files in your WP installation EXCEPT the “wp-content” folder.
4. Try to access WP Admin again.
This worked perfectly for me! From there, I was able to log back into my wpadmin and re-start the upgrade that previously failed.
Thanks so much!