Did you try with both config files? If you send them here, we can have a look.
On that note: Some of the BSL software ships with defaults baked into the application itself, instead of having the values persisted in a config file. If you open the BSL app and change anything, then quit, it saves all the values out and THEN they can be imported.
If you can, please send us a .zip file of this application folder.
Which laser - Brand and model is it exactly?