Linux
$HOME/.choosenim
You don't need to worry about this folder. It is used by the installer choosenim. When you upgrade Nim, the latest Nim version is downloaded and extracted here.
$HOME/.nimble
The folder ~/.nimble/bin must be in your PATH! So don't forget to add it to your PATH!
nimble is the name of Nim's package manager. Packages are downloaded in this folder (~/.nimble), and links to binaries are placed in ~/.nimble/bin .
The executables nim (the compiler) and nimble (the package manager) are also in ~/.nimble/bin .
Windows
Under Windows, .nimble/ is here: C:\Users\<user_name>\.nimble . Add the following folder to your PATH:
C:\Users\<user_name>\.nimble\bin