The link in your MTU Store account shows a download link for 10 days, then it disappears.
First, you should always write the downloaded installation file for all MTU products to a CDROM after downloading. This insures you have it in the future when you will need to reinstall that product. MTU does not provide back versions of our software. Only the current release version is available on-line.
To find the latest version, run the program, click the Help menu, then the Check for Updates command. This shows a web page with a DOWNLOAD button. Click this to get the latest version.
This works for all products except Hoster. When MTU makes a free version of Hoster available, we send out an email to everyone who has the right to download and install that version.