I could access the winner apps of the last year competition, but I couldn't download or view any of them.
Can anyone help me with that; how to download the winner apps of the last year?
You mean the hackathon 2020. This year it is called Appathon.
Results are here: https://hack2020.appinventor.mit.edu/results
Yes, I visited this link earlier but I couldn't download any of the apps.
This page contains only description of each winning app and some data about each one. But where is the app itself.
If I want to try any of them, how can I?
They are not available via the site. If users wanted to spread them they would have to do that by themselves. Maybe next time we can show some screenshots of the apps on the resultpage.
Maybe search the Gallery?