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

Verify original:
md5sum downloaded_file
sha256sum downloaded_file 

MD5: f282cf09308a2bbe8e93f4d7cd32e5eb

SHA-256: 1f888a26ba697d5908a68b6e63afa3c3e5af97a7c598f345c78d87683e2a8f6c

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.