Error found during installation

[sunnybau]

I am using grl_Software_Manual (https://ahundt.github.io/grl/_downloads/grl_Software_Manual.pdf) windows operating system (windows1064bit) and install Cygwin64 Terminal. When i enter this command (git clone https://github.com/ahundt/grl.git) the following error appear.
-bash: git: command not found
On the contrary
When i enter below command
tar xzf /path/to/downloaded/grl-$version.tar.gz
then i got following error
tar (child): /path/to/downloaded/grl-.tar.gz: Cannot open: No such file or directory
tar (child): Error is not recoverable: exiting now
tar: Child returned status 2
tar: Error is not recoverable: exiting now

Could you please suggest me what i need to do.
While it work in Linux.

[ahundt]

$version is a variable and you haven't set it to anything.
Maybe try the windows subsystem for linux?
https://msdn.microsoft.com/en-us/commandline/wsl/install_guide

However, we don't generally support windows at this time, unfortunately. I'm glad to hear linux works for you!