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error upgrading 7.5.4 to 7.5.5

It is download error. You can try to download full Plesk distributive ant try upgrade again.
 
If you already have 7.5.x installed, I would strongly suggest you to install update only.

Prior doing any updates to Plesk, stop all services (Plesk icon in sys tray -> Control Panel -> Select all -> Stop).

Last Plesk update took me 1 hour... consider updating it at night while traffic to your server is low.
 
thx matija,
this night I retry to install the patch. Maybe the firewall has blocked access to that internet url.
 
I had an error when downloading the 7.5.4 > 7.5.5 patch. I disabled the proxy settings on IE and Firefox and on the server and that did it for me. Hope that helps.
 
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