None. Zip. Zilch.
Tactical Arbitrage runs on cloud servers. There's nothing to download.
You start a search in the morning and then turn off your computer. Go to the gym and then visit a friend. Use your friend's computer to log into Tactical Arbitrage and check the search results.
Running on cloud servers means you're not tied down to one spot. In the end, that's what Tactical Arbitrage is all about: helping people break free from the 9-5 grind.