I'd be happy to help you with the given text!

The text appears to be a combination of information about downloading and using various versions of the Viber software. Here's a breakdown of the key points:

1. The first sentence mentions that there is a version 21.0.0 for Mac available for download.

2. The second sentence explains that Viber for Windows allows users to make free phone calls and chat with friends.

3. The third sentence directs readers to the TechSmith's Download Center if they want to install a previous version of the software.

4. The fourth sentence provides information about finding software keys, in case users have questions or concerns.

5. The fifth sentence mentions that the SDK (Software Development Kit) is available for free download on Mac personal computers only and not for Microsoft Windows PCs.

6. The sixth sentence explains what the SDK contains: sets of functions and services that give developers access to various iOS device attributes, such as hardware and software features.

The text also includes some international links in different languages:

* Télécharger Viber Windows FR (French)

* Descargar Viber en Windows ES (Spanish)

* Windows Viber download NL (Dutch)

* Windows Viber herunterladen DE (German)

These links likely direct users to the Viber website or other resources where they can download and install the software.

Let me know if you have any further questions or if there's anything else I can help you with!

Viber 21.0.0 for mac download