Unable to update or download extensions

Hello,

I’m using Knime Version 5.2.

Suddenly, I’m not being able to check any update or download new extensions.

I receive errors such like that:

Some sites could not be found. See the error log for more detail.

No repository found at https://update.knime.com/partner/5.2.

No repository found at https://update.knime.com/analytics-platform/5.2.

No repository found at https://update.knime.com/community-contributions/trusted/5.1.

No repository found at https://update.knime.com/community-contributions/5.2.

Most of these are the default ones. I’ve tryied to disable some and even find some more current sites in internet, but the error remains.

I’m not using VPN. Could Someone have any idea on how to solve it?

Thanks

Hervandil