I apologize for the delay in responding to your question. I believe that you do have the latest version available for Windows. I will create a separate topic so that the latest available version can more be clear for everyone. This is a screenshot of the most current version (of Seamly2d for windows) available on the seamly.net site
WINDOWS VERSION loaded from seamly.net as of June 2, 2020 >>>>>
As indicated by @slspencer, there are versions for different platforms and they will not always have the same date. I know there is an effort to create more recent builds for all platforms, but please be patient as all work is done by volunteers.
for a description of the area on this forum where you will see information about new releases. I have no doubt that when a new release becomes available for windows the information will be posted there