Basically the steps listed here, with 2 important steps missing from the manual fix:
Before you start, do this:
Use disk partition and delete the partition on the ReadyCache SSD.
You need to go to your %tmp% (typically Users\Account\AppData\Local\Temp) directory and delete everything before you start, some files might be in-use and locked, but delete as much as you can. Apparently there is a chance that some old file is interfering with the installation. (I ran into ExpressCache App launch issue and license retrival error)
Manul fix here:
*If you already removed your Windows.old path, SanDisk people can send you a copy of it. I do have a copy of it but I don’t want to get into any legal issue by sharing it.
This has resolve the issue for me.