diff -r c4b0d5cc34bc -r b3d8e196dac8 plover-gtk/transactionhelper.c
--- a/plover-gtk/transactionhelper.c	Mon Aug 31 07:07:40 2020 +0100
+++ b/plover-gtk/transactionhelper.c	Tue Jun 29 10:09:34 2021 +0100
@@ -492,10 +492,12 @@
     g_return_val_if_fail(PLOVER_IS_TRANSACTION_HELPER(helper),NULL);
     if (!helper->installed)
     {
-	comps=plover_transaction_helper_get_comps(helper,NULL);
+	comps=plover_transaction_helper_get_comps(helper,&error);
 	if (!comps)
 	{
-	    g_warning("plover_transaction_helper_get_installed: No comps");
+	    g_warning("plover_transaction_helper_get_installed: No comps: %s",
+	      error->message);
+	    g_error_free(error);
 	    return NULL;
 	}
 	install_root=getenv("RAZOR_ROOT");
@@ -656,13 +658,22 @@
   plover_transaction_helper_get_comps(PloverTransactionHelper *helper,
   GError **error)
 {
-    gchar *s;
+    char *s;
+    GError *tmp_err=NULL;
     g_return_val_if_fail(PLOVER_IS_TRANSACTION_HELPER(helper),NULL);
     if (!helper->comps && helper->base_uri)
     {
-	s=g_strconcat(helper->base_uri,"/repodata/comps.xml",NULL);
-	helper->comps=plover_comps_new_from_uri(s,error);
-	g_free(s);
+	s=razor_path_relative_to_uri(helper->base_uri,"repodata/comps.xml",
+	  NULL);
+	helper->comps=plover_comps_new_from_uri(s,&tmp_err);
+	if (!helper->comps)
+	{
+	    g_warning(
+	      "PloverTransactionHelper: Failed to get comps at '%s': %s",
+	      s,tmp_err->message);
+	    g_propagate_error(error,tmp_err);
+	}
+	free(s);
     }
     return helper->comps;
 }