The resampling/time stretching option which I have had in older versions of MAGIX Audio Cleaning Lab does not appear in the Effects menu of my MAGIX Audio Cleaning Lab II software. I am using Windows 10.
In that product generation, there would have been a distinction within the Cleaning Lab product line between your version and the more fully-featured "Audio & Music Lab Premium". Only the latter would have featured the resampling/time-stretching function you're looking for. That generation has since been superseded by a new version that is now sold under the SOUND FORGE brand: