Other hosts (zippyshare, solidfiles) have deleted ZXBInstaller files due to "inactivity." MediaFire’s retention policy for files with >100 downloads is indefinite. The specific v331mediafirerar upload has been re-verified by the community in 2023—checksums SHA-1: 7A4F2B8C... (see forum post #4812).
Use WinRAR or 7-Zip on the .part1.rar file; it will automatically pull the data from the others.
If you're looking for information on a specific software or tool, could you provide more details? For example, what is "zxbinstaller," and what is its purpose? Similarly, what are you trying to achieve with "dvd v331mediafirerar"?