the file you have is an .iso which has been compressed but it has the extension .txt
this was explained earlier
if you google 7zip and download it and install it this will help
right click the file and you should get the 7zip option , then use a folder on your desktop (or anywhere you choose) and extract to that, you will not be able to extract to the dvd....;;
or just copy the file to your desktop....and then 7zip it
but you will need about 5gb of space at least to copy , 7zip and install
Wait. What?
I have absolutely no clue how THAT could happen. The iso is ~1.85GB in size, waaaay below even FATs file size limit, IIRC.
Which OS are you using?
Which of the (several) download links did you use?
And, most importantly, do you still have the original files you downloaded?
i downloaded this one as well ; the extension was changed i think to confirm with the downloads sites rules , but it works