Hi there!
Error 1001 is a catch-all MSI error and unfortunately provides very little to help troubleshooting it. We recommend downloading
UltiDev Cassini legacy product and try to repair and uninstall. If that fails, please use
MSI cleanup utility as a last resort to remove corrupted installation (files will need to be deleted manually).
After that, you may want to install
UltiDev Web Server Pro (UWS) - it is backward compatible with legacy Cassini product and of higher quality.
As for patches distributed by email, in the past we have provided 32-bit build of Cassini, which is required when applications run 32-bit components, which does not appear to be the case here. If you manage to uninstall or remove failed Cassini installation, UWS should have no problem getting installed.
Please let us know if information has helped.
Best regards,
UltiDev Team.
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