Finding a file path

Hello,

I am very new to using this installer. I am using the installer to install a set of files for employees in our company but I want to use a path that they already have that is defined in a environment variable.

For example %DemoPath%/customer/

I want the installer to use %DemoPath% to find the location to install the files, how do I do this in the script?

You should probably start by looking in the help file for things related to environment variables, perhaps the instruction you are looking for is called Expand something something...

Try using this:

ReadEnvStr $0 DemoPath

More here, this is a good read: