As long as you're feeling brave.. Simply move everything to be in the home directory on linux.
git clone <this dir> ~/dotfiles/
mv ~/dotfiles/{.,}* ~
On windows .spacemacs needs to go elsewhere. Depends on emacs install loc.
path %path%;"C:\Users\Oisin Carroll\Downloads\emacs-w64-25.3-O2-with-modules\emacs\bin"
emacs -q --eval "(setq user-emacs-directory default-directory load-prefer-newer t)" --batch -l init.el -f doom//FUNCTION
Where FUNCTION is
reload-autoloads
packages-autoremove
packages-install
byte-compile -- -r