Hello @cristianoLopes my PC’s firewall is also disabled still I was unable to install updates. But now I have manually installed them. Thanks a lot @oana_hogoiu, @marpet and @cristianoLopes for the guidance you provided me. 
Hi,
I have the same issue. what am I suppose to exactly verify my proxy settings?
I can not open the links you put here. How should I know that it is due to server response or my enterprise proxy?
Hello,
Could you provide details about your SNAP version and try accessing the links using HTTPS?
https://step.esa.int/updatecenter/13.0/snap/updates.xml.gz
https://step.esa.int/updatecenter/13.0/snap-toolboxes/updates.xml.gz
https://step.esa.int/updatecenter/13.0/snap-supported-plugins/updates.xml.gz
https://step.esa.int/updatecenter/13.0/snap-community-plugins/updates.xml.gz
Hello, SNAP version is 13.0 (Windows 11)
Right now I could download these files that you have attached.
Are you still experiencing problems updating SNAP?
Can you try applying the solution described here and see if it makes a difference?
https://senbox.atlassian.net/wiki/spaces/SNAP/pages/1898053693/SNAP+FAQs#I’m-behind-a-proxy-and-having-difficulties-connecting-to-servers.-What-can-I-do%3F
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