Follow the below-mentioned instructions to use the sample data. 

1. Unzip the downloaded file and save it in an appropriate folder.
2. Name the folder for easy identification, say 'Sample TallyPrime Data'.
3. Press Alt+F3 (Select Company) from Gateway of Tally, browse to the path where you have saved the downloaded file, and load the sample company data.

You can now test the feature in TallyPrime using the sample data.