Lost Mine of Phandelver is a multiple awards winning adventure for D&D.

It came out in 2015, published by Wizards of the Coast, and has become a go-to for people starting out with the hobby.
Characters start out at level 1 and this lightly modified Roll20 version (which requires you use Roll20) there are five pre-genned characters, creatures with stats and click-to-roll actions and if you have a pro/plus account then dynamic lighting on the maps.
You can access this free to download version at the Roll20 marketplace.
The Lost Mine of Phandelver will not be free forever on Roll20. It was opened up at the start of this week as part of the “Stay at Home, Play at Home” project Roll20 are helping Wizards of the Coast with. It’ll be free until May 7th.
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it’s about 15 bucks how doI get the free download?
Hi, sorry to say it was only free until the 7th of May. The only way to get it free again is to wait and hope that WotC/Roll20 make it available free once more, which they might.