Hi @m-karing_2439 ,
The link on the "Dependencies" is provided for convenience; it's simply wrapping a <a href=... around items in the .nuspec file's Dependencies element. Without performing expensive lookups, there is no way to know if those packages are in the current feed, or if they're even valid packages or versions at all.
Keep in mind that, in many cases, dependencies won't even reference a single package (e.g. MyPackage-4.8.7) - but a whole range of versions (e.g. MyPackage-4.*). This is why it's impossible for ProGet (or any tool) to "resolve" the dependencies - it requires knowing all packages in project (plus the project's environmental configuration) to know which ranges to pick.
Note that, if those links yield a 404 then clients will also not be able to download them from thet feed.
Thanks,
Steve