BOINC

The feature you are trying to use is on a
network resource that is unavailable.

Click OK to try again, or enter an alternate path to a
folder containing the installation package ‘BOINC.msi’
In the box below.

Use source:
C:\Windows\Downloaded Installations\{7B0EB643-3966-4474-B417-F82930F9DFC8}\

Error 1706. No valid source code could be found for product
BOINC. The Windows Installer can not continue.

boinc_7.0.28_windows_x86_64 (version)

Dell Inspiron 630

Intel Core i5-2320 CPU @ 3.00 Ghz

6.00 GB Installed memory
4.92 GB usable

Windows 7 Home Premium (64 Bit)
Service Pack 1

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Please see this BOINC FAQ for help on this subject.

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Same problem here Mark. Attempting to upgrade a fully working BOINC version 6.something-or-other to 7.0.28 so that all my machines are running the same version has rendered it unusable.

In this case, the missing source appears to be

C:\Windows\Downloaded Installations\{08407DB1-DEAD-4769-86EB-B29C0EFAF11A}\

I though "DEAD" was a bit ominous given to proximity of hallowe'en :)

I note the suggestion that this is a Windows problem but it's odd that none of the other (many)software upgrades I have made to other apps in the last 12 months has caused this problem.