Cannot upload from 5.6.1.2 to 5.6.2.1 - Please Please Help !

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Dear C5 members,
I am trying to upload the usual way ( through dashboard, like I did before with no problems) but keep getting these :
THERE WAS AN ERROR UNPACKING YOUR FILE.Perhaps you have not uploaded a valid zip file,or you dont have zip installed.

Screenprint is in attacment.

I tried to fix it myself ,and made a bigger mess :(
Thank you for reading and answering!

m0207