Unable to install storage upgrader under Kola Nut 1.8.7

I wrote here already, my last step was (from the manual installation):

This is all I did. Apparently even though I got an error message the installation was successful.
I know this does not really make sense, but this is all I did.

edit: and I updated the problem list in the back-up topic: Problems with back-up / restore (standard app) - #9 by Ruth_FP1