Version 9.x license files work only with the Version 9.x series of products. However, you may easily run Version 8.x or earlier versions of extend products alongside Version 9.x products. To do this, simply install the products and license files in a separate directory for each version.
For example, if you place the Version 8.1.0 compiler and license file in the C:\Program Files\Micro Focus\Acucbl810\AcuGT directory, and place the Version 9.x compiler and license file in the C:\Program Files\Micro Focus\Acucbl8xx\AcuGT directory, either version of the compiler will execute properly.