Thank you for the response. I downloaded from the link (I am a Mac user, by the way) you posted. I have no problem with the download as before. The installer opens up... The installation window is the, and it says "Retrieving installation", I see the progress bar, but it does not install... the progress bar shows 0%.
After a while there comes another window saying " Error has been encountered. Close this window and try downloading again".
I don't know what's wrong?
I don't understand this; the installer on the link I posted is the full installer - it shouldn't go retrieving anything during the install.
Hopefully someone with more Mac experience than me will step in and help you.