Thank you for your feedback.
This approach is by design. The installator (.exe file) installs the latest version of Sitefinity.
In case you need the older version you have to download the archive (.zip) file.
I hope the information was useful.
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items