We’re sorry to hear that some people are having trouble uploading Intense. It’s tough to tell what the actual problem is because the message from WordPress is so generic. There may be an error in the error log that might help us further track down the issue.
If this error continues to happen, it may be best to install the plugin manually (via FTP) the first time. If anyone still continue to have problems, or if anyone can find out what the error is, please let us know.