CORRECT: A beta version is a way a company tests its "next great utility", but you put your PC at risk by using it, (or any beta program). In this case, IObit's defragmentation utility.
NOTE: Each subsequent beta version is not necessarily BETTER than it's predecessor. In many instances a "newer" beta version is a completely different version, deliberately leaving out previous features considered "proven & reliable”, or, “a bad idea", simply to test (on OUR pc's) a few new algorithms. Eventually the developers extract from each beta version all the "good things" for the final product. This then is often offered as a “free trial” download, but to have all the ‘bells-n-whistles’ you have to BUY the full version.
TESTING done in my labs indicate it's not unusual for other programs to show a much different percentage defragmentation compared to IObit's. Their defragmentation percentage is reported as much better than the true results. They have a lot of bugs to work out yet. (On your PC!)
RECOMMENDATION: Uninstall IObit Defrag and do NOT use it until the beta versions are gone. Wait for the hopefully safer and final commercial version.
PS: Those bug report pop-ups? Don’t expect to ever receive a reply; it’s just not done in the beta testing industry. The most you can expect is a User's Forum, since most people do not bother to send in th e bug reports. All they want to know from those reports is how severely their cute little program has screwed up you computer. . .