To force import of older manifests, the "force" option must be passed to the import API. This needs to be controlled via UI and CLI.

diff --git a/src/app/controllers/providers_controller.rb b/src/app/controllers/providers_controller.rb
index ffbe968..d0f3c24 100644
--- a/src/app/controllers/providers_controller.rb
+++ b/src/app/controllers/providers_controller.rb
@@ -65,7 +65,7 @@ class ProvidersController < ApplicationController
         temp_file = File.new(File.join(dir, "import_#{SecureRandom.hex(10)}.zip"), 'w+', 0600)
         temp_file.write params[:provider][:contents].read
         temp_file.close
-        @provider.import_manifest File.expand_path(temp_file.path)
+        @provider.import_manifest(File.expand_path(temp_file.path), {:force => "true"})
         notice _("Subscription manifest uploaded successfully for provider '%{name}'. Please enable t
       rescue Exception => error
         display_message = parse_display_message(error.response)