So it might be a while before 3.3 is actually pushed out to everyone automatically. In the meantime, you can manually download it from the GitHub if you like.
1. Go to the
main Github page.
2. Click on the big green "Code" button.
3. Click "Download ZIP".
4. Extract all the contents into your 5e data folder. The default installation path is C:\ProgramData\Hero Lab\data\5e, but you may have placed it elsewhere. You will be asked to overwrite many files. If you want to be safe, you can copy your 5e folder elsewhere before extracting the new stuff. Hero Lab does this automatically to the "importbackup" folder when it's doing the installing, so you can use that folder or save it elsewhere.
5. Close and re-open Hero Lab.
6. Enjoy!