I have uploaded the new 1.5.5 beta copied the new files to a test file set and used the zc_install.
The result is what cen be seen by the screen captures I made.
It tells that the db was correctly updated to 1.5.3 but then it says I need to update it because I am on 1.5.2!
kind of confusing and no way to proceed with the upgrade.
Please help if possible.
ThanksClick image for larger version. 

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