Software interface design changes, or entire redesigns, are often controversial updates. It happens that visual updates are disliked that much that users move to alternatives instead. We have seen that with Firefox's Australis update in recent time when users moved to alternatives such as Pale Moon after the update.
A first beta version of CCleaner 5.0 has been released yesterday. CCleaner 5.0 is the upcoming version of the popular temporary files cleaner and system utility for the Windows operating system.
The build that Piriform released yesterday includes only the new interface and none of the other changes that the company plans to ship in CCleaner 5.0.
The beta installs over the current version of the program on Windows if it is installed on the system. It does not seem to be available as a portable version right now and the provided version won't interfere with portable versions of the program if available on the system.