installation went fine, however instead of adding your overrides to existing ones (like most prestashop modules do), you just create a backup and replace existing overrides. really? this renders our shop useless and is not following prestashop practice.
but the real problem is that after creating a simple coupon with 10% overall discount and a code, I go to front end and enter the code only to get an error:
There is 1 error
This voucher does not exists.
I can see the code in the admin and it's activated.
This module seems untested and has major installation issues as described above.