To download and make responsive websites using the Bootstrap framework which is an powerful desktop app you need to first download Google Chrome Browser.
After the Chrome download run it in your Chrome Browser and use it as you wish.
Note: You might be needing a professional host service to host your site after you make it with Bootstrap. Allpcdownload suggest you few professional and yet affordable web hosting service. ( Don't worry Your download link is just after it)
HostGator: Unlimited disk space, emails, and bandwidth on all plans. Just 3.96$ to start with.
BlueHost: Super modern hardware and FREE domain included. Just 3.49$ to get started.
iPage: Featuring easy setup and superb reliability since 1998. Just 2.25$ to make a site on it.
Siteground: Unlimited email hosting at your FREE domain. FREE website builder and easy management via cPanel. 3.95$ is the cost.
Thats it choose from these easy to setup hosting to host your site.
Now here is the link for Bootstrap Studio Download.