Is the installation stock in a loop?
If so access the file /www/administrator/components/com_awocoupon/awocoupon_j3.xml and change the version from 3.5.7.0 to the version you are installing. This will stop the loop.
Then go to /www/administrator/components/com_awocoupon/awocoupon/library/install/upgrade/sql folder. There you will see the sql for all versions. Using phpmyadmin or some sql program, run the queries manually for 3.5.8.sql.