Although Rifftrax and Fathom Events were able to secure rights to show Anaconda (1997) in theaters with live riffing for one night (plus encore), they were not able to gain home video or on-demand rights to the live event. As such, the full version of this live event has never, and probably will never, be released in any capacity outside these two theatrical showings.
Both this and RiffTrax Live: Godzilla (2014) were funded via Kickstarter. The showing of Anaconda (1997) was a stretch goal, that was met when the Kickstarter surpassed $250,000.