Index: branches/RC/core/install.php
===================================================================
diff -u -r11610 -r11623
--- branches/RC/core/install.php	(.../install.php)	(revision 11610)
+++ branches/RC/core/install.php	(.../install.php)	(revision 11623)
@@ -457,23 +457,11 @@
 						break;
 					}
 
-					// check interface modules
-					$available_modules = $selected_modules = Array ();
-					$interface_modules = Array ('Core', 'Proj-Base');
-					foreach ($interface_modules as $interface_module) {
-						$module_folder = strtolower($interface_module);
-
-						if (file_exists(MODULES_PATH . '/' . $module_folder)) {
-							array_push($available_modules, $interface_module);
-						}
-
-						$module_selected[$interface_module] = in_array($module_folder, $modules);
+					// check interface module
+					if (!in_array('core', $modules)) {
+						$this->errorMessage = 'Please select "Core" as interface module';
 					}
 
-					if (!$module_selected['Core'] && !$module_selected['Proj-Base']) {
-						$this->errorMessage = 'Please ' . ($modules ? 'also ' : '') . 'select "' . implode('" or "', $available_modules) . '" as interface module';
-					}
-
 					$status = $this->errorMessage == '';
 					break;
 			}