In that case, it would make sense for you to only provide one download- the latest version of the theme- in the email after one makes a purchase. Otherwise, it is a little confusing.
Also, I checked the date the themes/files were created, and it actually said that the Yugan Pro (6.1 MB) was created in Dec 2018, whereas Yugen 1.2.1 (5.7 MB) was created in September 2018. So it looks like the one with the lower digits is latest. Is this an error?