finally got it working again by the following:
- Downloaded the latest zip
- Copied all files (excluding all files beginning with “.”) to my web folder, overwriting what was there
sudo chown -R www-data:www-data mywebfolder/- In browser went to https://mywebsite/update?secret=mysecretkeyhere
- Got message asking me to reload after a while, which I did
Hopefully this helps someone else who may be stuck. Thanks.