Update Linux installer

externals/install-dotnet.sh

@@ -753,9 +753,8 @@ download() {
         elif machine_has "wget"; then
             downloadwget "$remote_path" "$out_path" || failed=true
         else
-            unset http_code
-            download_error_msg="Missing dependency: neither curl nor wget was found."
-            break
+            say_err "Missing dependency: neither curl nor wget was found."
+            exit 1
         fi
 
         if [ "$failed" = false ] || [ $attempts -ge 3 ] || { [ ! -z $http_code ] && [ $http_code = "404" ]; }; then
@@ -905,10 +904,10 @@ install_dotnet() {
 
     # The download function will set variables $http_code and $download_error_msg in case of failure.
     download "$download_link" "$zip_path" 2>&1 || download_failed=true
-    primary_path_http_code="$http_code"; primary_path_download_error_msg="$download_error_msg"
 
     #  if the download fails, download the legacy_download_link
     if [ "$download_failed" = true ]; then
+        primary_path_http_code="$http_code"; primary_path_download_error_msg="$download_error_msg"
         case $primary_path_http_code in
         404)
             say "The resource at $download_link is not available."
@@ -928,9 +927,9 @@ install_dotnet() {
 
             # The download function will set variables $http_code and $download_error_msg in case of failure.
             download "$download_link" "$zip_path" 2>&1 || download_failed=true
-            legacy_path_http_code="$http_code";  legacy_path_download_error_msg="$download_error_msg"
 
             if [ "$download_failed" = true ]; then
+                legacy_path_http_code="$http_code";  legacy_path_download_error_msg="$download_error_msg"
                 case $legacy_path_http_code in
                 404)
                     say "The resource at $download_link is not available."