Sometimes your browser, most notably Internet Explorer, will strip out the file extension of some downloads. This can happen in particular with .exe files which we use for installing our software.
If a message pops up asking you what programme or application to use to open your software download, this is probably because the file extension has been removed.
To solve the problem, find the file you’ve downloaded, right click on it and select ‘Rename’. Then add ‘.exe’ to the end of the file name shown.
You should now be able to double click on the file to start the installation process.