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I followed the steps in https://sendy.co/get-updated and now I get a login screen with no css. When I login I get this message https://gyazo.com/7c30e0bd29eba74798d95fe54a88065d
I was just going from 2.0.2 to 2.0.4.
I made a copy of the /sendy folder if we need something out of it.
If you need in my server I will need your IP address because I use sftp and I am on Amazon EC2.
Try doing a full re-upgrade to the latest version of Sendy:
Download the full build of Sendy from http://sendy.co/get-updated (use the form right at the top to download the full build of Sendy).
Then re-upload all of Sendy's files to your server (except /includes/config.php and /uploads/ folder) replacing the old ones.
Make sure all necessary files are uploaded.
That did it. Thanks for the help and great support.