Hi @k10shetty1,
I don’t know if you already saw this, or if it could be related to @kowisoft’s colleagues accessing the update sites, but there appears to be a problem with downloading the zip of the KNIME Community Extensions (Trusted) for 5.5
Attempting to download this link returns a page not found:
In the meantime, @kowisoft - you have my deepest sympathy.
The countless hours of my life I’ll never get back, sacrificed at the altar of the great corporate security overlords… something suddenly isn’t working and you cannot tell if it’s just misconfigured or maybe Dave from InfoSec is having a bad day and has decided to reroute all port 443 traffic through a toaster for inspection… 
“Trust no one. Block everything. If it’s open-source, it must be evil. If it’s useful, double the firewall. Don’t allow automation. Ever!; it leads to viruses!”
