Verify the NTFS permissions of the following directories:
\Program Files\CA\DSM\Web Console
For each directory, right click -> Properties -> Security
ensure that READ/EXECUTE NTFS permissions for Local Group Users are present.
If no "Users" group is present, click on ADD -> Location -> select the server name then click on "Advanced" and select "Users" from the list, then confirm by clicking OK
Check if the patch moves to the "packaging" status and if the URL is working fine.