Download otpTOK for Android. It is very important that you verify that it is the original using MD5 or SHA-256. or SHA-1

Verify original from bash:

$ md5sum downloaded_file
MD5: cbd02d4bfe9516ed656f63b80deadebb

$ sha256sum downloaded_file
SHA-256: 6f5a520279303bb655432ee8bc490d30a0f12129425c0676e8dd70645ec0130f

$ sha1sum downloaded_file
SHA-1: 059c3cfec7450d7d9acc955e27acb430006bb09f

It is very important that check supported operating system versions at https://otptok.com/downloads before using the application.

Then, unzip the file and follow the steps in README.txt.