Lost BB OS 4.5 on PC after DM 4.7 update

I think this is a non-issue, but wanted confirmation.

I use OS 4.5 on my B--updated this two weeks ago from 4.3. I saw the BB OS 4.5 in my add/remove programs on PC's control panel.

Tonight I removed desktop manager 4.6 and installed the new DM 4.7. Now I notice that my BB OS 4.5 is no longer in my add/remove programs in control panel.

Everything seems to work fine. The new DM recognized my BB and I was able to back it up successfully.

Do I need to re-install BB OS 4.5 on my PC? If so, why? If not, will I be missing anything in terms of utilization?