How do I access an older andriod app version?

Hi, I have a strong dislike of the layout of the home page of the latest app version. The compressed view for the saved searches make it really hard to see and review the items displayed. I want to buy items from my saved searches. I do not want to buy real estate, which is what trademe homepage is now pushing instead. I would like to roll the app back to the previous version. How do i access the apk file of the last version before this formatting change? Thanks for your support :)