Hi! Depending on the operating system you are running, right click on the downloaded file and select an option that says "extract." Make sure that all of the files and folders are properly extracted, and then run the Hive Time executable (a .x86_64 file on Linux, a .exe file on windows, and a .app bundle on Mac).
If you're still having trouble, you may want to consider using the Itch.io app https://itch.io/app