Hi there!
Thanks for your help, but it did just produce new fatal errors:
Plugin could not be activated because it triggered a fatal error.
Warning: require_once(/home/www/seimei.dev.esucces.dk/wp-content/plugins/wti-like-post/wti_like_post_widgets.php) [function.require-once]: failed to open stream: No such file or directory in /home/www/seimei.dev.esucces.dk/wp-content/plugins/wti-like-post-pro-2.0/wti_like_post.php on line 408
Fatal error: require_once() [function.require]: Failed opening required ‘/home/www/seimei.dev.esucces.dk/wp-content/plugins/wti-like-post/wti_like_post_widgets.php’ (include_path=’.:/php/includes:/usr/share/php’) in /home/www/seimei.dev.esucces.dk/wp-content/plugins/wti-like-post-pro-2.0/wti_like_post.php on line 408