Completed the upgrade from 4-5 over the weekend, didn't go quite so smoothly as hoped but all now working. My events list for anyone else who goes through this and has similar little troubles:-
1. Disabled the run as service option.
2. Exported settings.
2. Rebooted PC just so it was nice an fresh as been up for over month.
3. Located my full serial number and upgrade codes in case needed later.
4. Installed BI5 from full installer download.
5. Started up BI5 and all looked great.
6. Enabled run as service.
7. Rebooted just for tidyness after install.
8. Uninstalled BI4, selected to leave settings (although expected this to not happen).
9. Rebooted again.
10. Tried to start BI5, it loaded with what appeared to be lost settings as expected but then it just quit.
11. Tried to start again, just splash screen and quit.
12. Rebooted.
13. Tried to start again, it loaded as before but then quite straight away.
14. Reinstalled BI5, tried repair but no good still same issue.
15. Uninstalled BI5, rebooted, reinstalled, same issue.
16. Uninstalled BI5, deleted all the BI registry entries I could find along with the BI folders and the existing captured files.
17. Re-Installed BI5, loaded up, entered original key and all loaded ok, no previous settings obviously at the moment.
18. Imported BI4 exported settings, restarted BI5 and all now ok.
Had a couple of instances where the Android app can't connect for a minute or 2 but that seems to have settled now and all seems to be running smoothly, alerting, schedules, zones, notifications on email\push etc all ok.
BI5 is looking really good to me so far.
Cheers,
Mike