Bootstrap isn't a typical installer. It isn't an application that way. It is just a collection of files(essentially a boilerplate code template) that you can use and get started building professional looking websites without being a real designer.
You can download it from
their site[
^].
If you want to use it along with asp.net or asp.net MVC then you can also install it with or without Nuget in Visual Studio. See
this excellent article[
^] on it.
Hope it helps you.
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