I just purchased the Sendy upgrade (6.x), and downloaded the latest version.
I unzipped the file and went through the rest of the 6 update steps (listed here: https://sendy.co/get-updated)
Note: I did not touch any .htaccess files or transfer language files.
All the files seem to have transferred & replaced existing files--but Sendy doesn't appear to have updated.
Notes:
- I'm hosting on Cloudways
- I used Forklife on Mac for FTP, etc.
- I logged out of Sendy on my server (and back in again)
- I cleared cookies
- I waited over an hour