I'm using WP 3.5.1 with multi-site installation and updated few plugins at the same time with auto mass update function. All the other plugins were updated except Contant Form plugin. Error what I receive is Could not remove the old plugin. Current version of the CF plugin I have is 3.25 and I'm trying to update it to 3.36. I tried to google around and found problems that plugin was unable to update. I tried few possible solutions years ago but those didn't help me. It's also weird that all the other plugins were updated succesfully. Where might be the problem?