Hi Eduardo.
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I've just sent you a private message from the Diffraction Limited forum with the download link for MaxIm DL 6.50, just double click the file after you download it to install MaxIm DL6.50.
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If you don't receive the PM in your email inbox then log-in to the Diffraction Limited support forum and look for the link your personal messages at the top right of the home page when logged in.
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The first time you startup MaxIm DL6.50 after installation you'll be asked to enter your licence key, use the licence file that was attached to the email you received from Diffraction Limited when you purchased MaxIm DL7.
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Not sure what is going on with the Diffraction Limited forum lately as no-one seems to be answering support questions, perhaps they have staffing problems at the moment?
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As you have bought and paid for MaxIm DL7 (and DL6 previously) they should be offering better support, hopefully just a temporary glitch.
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Will.
WILL B