Finding the 4.12 installer requires navigating Trimble's legacy support channels. Official Sources
Here is the safe, official method:
If you are looking to get this running today, I can help you: Verify if your meet the 4.12 requirements. Troubleshoot HASP driver issues for the USB key. Find the specific patch notes for the 4.12 update. trimble business center hce 4.12 download