Updating from My Account…where is the actual download link in My Account?

Hello, I am trying to update to the lastest version of Catch Box Pro, but I can only find a download in the commercial pay which askes me to pay again for it. I just purchased this theme around April, Do I have to pay again everytime there is an upodate? If not, where is the download link? I cannot find it in My Account page as the instructions says...the only links I saw in My Account are to change password and edit shipping address. Thank you in advance. Luis