Index: /applications/editors/josm/plugins/pluginmanager/src/at/dallermassl/josm/plugin/pluginmanager/PluginResource.java
===================================================================
--- /applications/editors/josm/plugins/pluginmanager/src/at/dallermassl/josm/plugin/pluginmanager/PluginResource.java	(revision 3414)
+++ /applications/editors/josm/plugins/pluginmanager/src/at/dallermassl/josm/plugin/pluginmanager/PluginResource.java	(revision 3415)
@@ -78,4 +78,9 @@
     public void install() {
        File targetFile = new File(target);
+       if(targetFile.isDirectory() 
+          || targetFile.getAbsolutePath().endsWith("/") 
+          || targetFile.getAbsolutePath().endsWith("\\")) {
+           targetFile = new File(targetFile, resourceUrl.getFile());
+       }
        File parentDir = targetFile.getParentFile();
        if(!parentDir.exists() && !parentDir.mkdirs()) {