When BOINC install asks to uninstall previous version cancel and do this first.
Go to current BOINC Directory on hard drive and copy
These Folders:
projects
slots

And these Files:
account_xxx.xml
client_state.xml
client_state_prev.xml
global_prefs.xml
sched_reply_xxx.xml
sched_request_xxx.xml

Run BOINC install until complete but do not check to run.
Paste
These Folders:
projects
slots

And these Files:
account_xxx.xml
client_state.xml
client_state_prev.xml
global_prefs.xml
sched_reply_xxx.xml
sched_request_xxx.xml

to current BOINC Directory and now run BOINC.
No need to reattach to project. No need to be assigned new host. No need to download executables for each project. No need to download new WU. No need to stop crunching WU that was processing before upgrade. No need to re-download custom background for screensaver. No need to overload Berkeley Servers during every update. No need to keep typing!
Try this on your system. Prove me wrong.
Rom. I bet you can incorporate this copy/paste in a future BOINC install eh?

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I did not need to reattach so no new host, that seems like a lot of work for very little gain....All you do is uninstall you do not detach, all the files are still in BOINC's directory......Procedure I use is suspend BOINC, exit, uninstall, reinstall in same directory and start crunching.......

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Semper Eadem
So long Paul, it has been a hell of a ride.

Park your ego's, fire up the computers, Science YES, Credits No.

Boinc uninstall does not delete the xml files and the project & slots folders.

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Fred
BOINC Alpha, BOINC Beta, LHC Alpha, Einstein Alpha