It is not necessary for you to include a link to How to Download in your descriptions. The link appears under the download button on every set page.
It is also not necessary for you to repeat this information in the comment section on a set page for the same reason.
Your set descriptions are a bit spammy lately with information that would be better placed in your profile. Your set description area should only include information directly relating to the set. General information such as your Facebook, YouTube, Twitter, DeviantArt, blogspot and forum linkage should be on your profile.