I’m having the exact same problem when I do my manual updates.
Information about current update:
Last encountered error: Another instance of setup is already running. Please wait until it finishes and then try to run it again.
That error can occur if you invoke a manual update while auto update is running and hasn’t finished yet. It just means that there are 2 instances of setup.exe avast.setup running at the same time.
With the time difference I don’t know if you are up to date or not. The version you posted, 071115-0, is the version for Nov, 15, 2007. It shows that it updated from the previous version. The current version is 071116-0, created Friday, Nov 16 2007.
Just a note, avast will check for and update automaticaly at startup, depending on your settings. If you do a manual update right after startup, you will probably get the error.
Double clicking…
avast checks if there is an available connection each 40 seconds.
If there isn’t, wait more 40 seconds to check. Checking does not take more than one second and, of course, does not use the Internet band.
If there is a connection, check for an update. If there is not any new file to download, wait 4 hours to start checking again. If there is an available update, start it and install it. Again, wait 4 hours to check the next time.
Some of this settings could be configurated different, I posted the default values of the avast4.ini file.