TV for Instagram - InstaCast 1.4 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The actual developer of this free Mac application is Sparkling Apps. The program belongs to Communication Tools. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software.
From the developer:
TV for Instagram - InstaCast allows you to share your favorite photos or videos from your Mac directly to your TV connected to the same network. It lets you share images across all Internet-connected SmartTV’s and Chromecast devices. To share the images, you’ll need an active Internet connection.
You may want to check out more software for Mac, such as PhotoGrids for Instagram, PhotoFlume for Instagram or GWPhoto for Instagram, which might be related to TV for Instagram - InstaCast.