It’s looking like your website is currently affected by an FTP issue if you just wait to help then you will be able to upload the alternative file manager in the future
The developers are constantly improving the FTP system, just today they’ve announced they’ve resolved the timeout issue which affected free users, after logging into the file manager most users would be pushed out in 15-30 seconds, now it should be a lot longer to enable quick file edits here and there.
In the future they’ll hopefully get the FTP nodes 100% stable to provide everyone access to their files all the time despite the traffic on the free network
I’ll try and ping you here on the forum and likely will private message you with login details to the stable manager once I’ve uploaded it fingers crossed.