I am just done with Drupal Commerce Installation on drupal 8.
I followed these steps:
1.Point to Drupal 8 root folder
2.Install commerce module
drush dl commerce
It has following dependencies:
drush dl entity
drush dl inline_entity_form
drush dl profile
drush dl address
drush dl state_machine
9. Now install dependencies with composer install.
10.Install composer manager
drush dl composer_manager
11.Initialise composer script
12. If you are facing any error like
[RuntimeException] The .git directory is missing from
then delete that subfolder in vendor folder like in my case:
rm -rf vendor/jcalderonzumba/gastonjs
then again repeat the step that is:
13. Now install commerce module and all sub modules of commerce.
Hope it will helps :)