You provided a block of text and a key value. The key is 'MassTube Plus 17.0.0.502 for mac instal'. It appears to be a request for assistance with downloading or installing MassTube Plus software on a Mac.

To assist you, I'll provide some information about the software and its download process.

MassTube Plus is a video downloader software that allows users to grab their favorite YouTube videos in high-definition (HD) quality. The software is available for both Windows and macOS operating systems.

Based on your key value, it seems you are looking for the MassTube Plus 17.0.0.502 version specifically designed for Mac installation. Here's a step-by-step guide to help you download and install the software:

1. Click on this link: 2. Once the download completes, open the downloaded file (.dmg or .pkg) and follow the installation instructions.

3. Follow the prompts to select the installation location and agree to the terms of service.

4. Wait for the installation process to complete.

If you encounter any issues during the download or installation process, please feel free to ask, and I'll do my best to assist you.

Additionally, if you're interested in exploring other features or versions of MassTube Plus, I can provide more information on that as well.