feat(install): Follow HTTP redirections when downloading a file

lib/install.ps1

@@ -365,7 +365,41 @@ function dl($url, $to, $cookies, $progress) {
         }
     }
 
-    $wres = $wreq.getresponse()
+    try {
+        $wres = $wreq.GetResponse()
+    } catch [System.Net.WebException] {
+        $exc = $_.Exception
+        $handledCodes = @(
+            [System.Net.HttpStatusCode]::MovedPermanently,  # HTTP 301
+            [System.Net.HttpStatusCode]::Found,             # HTTP 302
+            [System.Net.HttpStatusCode]::SeeOther,          # HTTP 303
+            [System.Net.HttpStatusCode]::TemporaryRedirect  # HTTP 307
+        )
+
+        # Only handle redirection codes
+        $redirectRes = $exc.Response
+        if ($handledCodes -notcontains $redirectRes.StatusCode) {
+            throw $exc
+        }
+
+        # Get the new location of the file
+        if ((-not $redirectRes.Headers) -or ($redirectRes.Headers -notcontains 'Location')) {
+            throw $exc
+        }
+
+        $newUrl = $redirectRes.Headers['Location']
+        info "Following redirect to $newUrl..."
+
+        # Handle manual file rename
+        if ($url -like '*#/*') {
+            $null, $postfix = $url -split '#/'
+            $newUrl = "$newUrl#/$postfix"
+        }
+
+        dl $newUrl $to $cookies $progress
+        return
+    }
+
     $total = $wres.ContentLength
     if($total -eq -1 -and $wreq -is [net.ftpwebrequest]) {
         $total = ftp_file_size($url)