Many reliable repositories currently host version 6.4.1208 , which is the most stable and widely available legacy version. Modern, Safer Alternatives
Since Ultra Video Joiner is older software, you might find better performance and more features in modern, free alternatives: aone-ultra-video-joiner-v6-5-0401-full-patch-free-download
If you decide to download legacy software from third-party sites, always scan the file with updated antivirus software before opening it. Many reliable repositories currently host version 6
Joiner for Video Files PRO - Free download and install on Windows aone-ultra-video-joiner-v6-5-0401-full-patch-free-download