1. could be running from a network location, and may need to copy it locally and run it from there. 2. Error 2755 occurs when Windows Installer attempts to add an empty environment variable during the installation.
Remove environment variables that contain empty values from the Windows Installer package (.MSI). View the Environment table in Setup Editor for empty values. The Value column must have a value to avoid error 2755. Also, check for possible registry keys specific to environment variables. View the Registry page in Installation Expert for the following registry keys: HKEY_CURRENT_USER\Environment HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment. Unfortunately, this is a known issue with Windows Installer 1.0 and Windows Installer 1.1. For more information about this issue, including the resolution, please see Microsoft Knowledgebase article number Q245413, "Windows Installer Fails When Environment Variables Are Improperly Set."
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This will clear the history and restart the chat.