Apart from the lower version, from which the driver didn’t run at first I forced the drivers to reinstall as well:
C:\Program Files\Diskeeper Corporation\ExpressCache\excfs\excfs.inf
C:\Program Files\Diskeeper Corporation\ExpressCache\excsd\excsd.inf.
Now it tells me Product is not licensed to run on this system.
So it is not really a Sandisk-program at all… Bad luck… However Windows 10 native caching is speeding up, it can find things in the menu-search now…