Just change the BMAN_DOWNLOAD var to where you want it installed, then delete the original bman.cmd file
Make sure this script has permission to access that folder
Don't forget to add [BMAN_DOWNLOAD]\bin to PATH
See bman -h for command info
When a version is required the syntax is bman [option] [major version] [minor version]
Note, there is a space between the major and minor version rather than a dash or dot