From what I gather, basically the Win10 upgrade path leave ReadyCache in a bad state. These are the high level step to resolve it:
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Unintall the current bad installation (Windows.old copy method).
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This allows you to install ReadyCache again, and you need to stop the ReadyCache service
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Then you do another uninstall, this should clean up all bad state.
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Then you install again, this time it should work normally.
It looks to me that you are stuck on step 1. If you still have the Windows.old files you can copy it and give it a try. Otherwise uninstaller tools should help in this case.
What I personally had encountered is some bad files in my %tmp% path which prevents a good installation on step 4, once I sort that out it’s been working as before for me.
