1. Install this application with administrative rights

2. Copy the cfg file "C:\Program Files (x86)\Bentley\PSC_AddIns\PSC_Addins.cfg" 
     to the ..\config\appl folder of the product you want to run it in.
     i.e. for PowerGEOPAK it would be: 
     "C:\Program Files (x86)\Bentley\PowerGEOPAK V8i (SELECTSeries 4)\PowerGEOPAK\config\appl\"

3. Edit the DeleteUnusedFonts.dll.config file in the install folder (C:\Program Files (x86)\Bentley\PSC_AddIns) for default options.

4. Make the folder where you specify the log file to be written to in step 3 above.

5. Open MicroStation (or whatever product you set the cfg file to run in) and key in deleteunusedfonts start without the quotes.  
    For example, I used PowerGEOPAK and an untitled workspace.

6. This does require interaction.  I chose to not update any v7 files and also I chose to open readonly files as readonly.  
    Note, the readonly files will not make a log entry so if they are suspect, manually check those.
    
7. Once completed, delete the config file copied over in step 2 above.