I'm testing switching locations of download url when using updater.exe (by passing in the url via -url command line option). During the tests I noticed that the updater would sometimes not detect new updates. After troubleshooting I tracked it down to the fact that the updates.aiu file was not being downloaded. I then figured out that it was most likely due do the fact that the timestamp of downloaded updates.aiu file was newer than the one on the server so I'm guessing Advanced Installer decides not to download the file again.
For now my workaround is to always delete the updates.aiu file, before checking for new updates, so that the file always gets downloaded. Is there a better way of dealing with this? Can I configure updater.exe to always download the file, ignoring the timestamp?