I followed your video of OPNET 14.5 in Windows 8. Only difference was that i had windows 8.1. But i made all the necessary changes in env variables.
When i run opnet i get following 2 messages..
1) Cannot enable ETS Scripting due to missing files. This is because <opnet_release_dir>\sys\lib is not included in mod_dirs preference. You may proceed but certain functions may not behave as documented. Then i clicked on OK.
2) After clicking OK i get message "unable to load editor configuration file because the file could not be found"
Please can you assist me ?....