If you need the Pro features, purchase it directly from the official MightyText website.
Version "16.60" in this context is often fabricated or outdated, used as a "keyword filler" to catch users looking for any recent version of the software.
MightyText requires access to your Google account and phone messages. Using a "cracked" version gives attackers direct access to your private SMS conversations and 2FA (Two-Factor Authentication) codes.
MightyText offers a free version with a limited number of messages per month.
Instead of seeking a crack, which compromises your personal data, you should:
Use Microsoft Phone Link (Windows) or Google Messages for Web (Android), both of which are free, secure, and officially supported.