Quote Originally Posted by mc12345678 View Post
Then in admin once logged in goto the following file and install/upgrade, existing variants will remain, but your SBA settings will be reset to the default values.
I just installed this on a 1.5.5 site and there were no issues (Except the instructions ;-) )

The file that you should go to to complete the install is www.domain.com/admin/stock_by_attr_install.php. Which btw works flawlessly.