If you are having issues downloading iMindMap, we would suggest that you download and utilise a download manager. This software speeds up downloads and should a download be lost part way through, it will recover and start again from where it got to.
Here are two download managers which can be downloaded free of charge from www.download.com:
Copy and paste the following URLs into your browser...
The above information will also resolve any 'Archive Corrupted' messages.
This should enable you to download iMindMap.