P: FTP transfer failed with message 'an unknown error occurred' 8/21/18

This worked up until last week. I have verified the login credentials via filezilla, which works perfectly. I have also contacted my web host, and they have said that the error that they see on their end is that Lightroom is using an outdated sftp protocol, which is no longer considered secure, and is no longer supported on their server.

 

The sftp requirements for my host are listed here:

https://wpengine.com/support/sftp/

 

I am running the latest version of lightroom classic CC. I appreciate your help in getting this issue resolved quickly. I have also try deleting the preset and making a new one with no change. Thank you.