i found a workaround for this problem...
commenting 26. line of q2a-network/qa-plugin.php to
//qa_register_plugin_module('module', 'qa-network-migrate-admin.php', 'qa_network_migrate_admin', 'Network Site Post Migration');
makes migrate feature disabled so other form becames visible... if you need migration, you can enable it later after your configuration done...
this bug should be fixed anyway..