prospective clients are not going to click download here to see a newsletter. Too much to ask.
Some prospective clients won't click download to see a newsletter.
Others, like me, still think email should be text, and will blacklist anyone who tries to send them HTML or graphics-laden email.
If this is a newsletter people subscribe to, why not offer them a choice which format they want to receive? If you do offer such a choice, be sure to honor it. I've had to unsubscribe from newsletters that let me state a preference and then send me HTML anyway.