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After updating to the latest version, one of our brands gets a 404 error message, but all other brands still work fine.
http://www.mydomain.com/sendy/app/?i=1 returns the error message, but all other brands (URL's ending with 1-5) works fine.
I suggest re-uploading Sendy to make sure all necessary files are uploaded:
Download a copy of Sendy from http://sendy.co/get-updated with your license key (use the form at the top left of the page to download 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.