The latest version of the SSL remote programs that are now Catalina compatible may show as decompression failed once downloaded in Safari
This error occurs only in Safari if the "Open Safe Files" option is on. When the download is completed, Safari will attempt to unzip the archive but will return this message.
To resolve this issue; disable the "Open Safe Files option in the general tab of Safari preferences.
Alternatively you could use a different browser like Chrome or Firefox.