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These scripts can grow quite large and are typically dependent on the overall size of a product. The rollback script is essentially those operations in reverse order.

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These scripts contain all the operations that Windows Installer will perform when the script is executed. But because Windows Installer is a transactional installation engine, unless rollback is disabled using either the DISABLEROLLBACK property or DisableRollback system policy a second script for rolling back the installation is generated. There are two primary phases for Windows Installer: generate an installation script, then execute the installation script. These files cannot be deleted or future maintenance installations on products – including even uninstalling a product – will fail.

This location is under %WINDIR%Installer.

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Patch packages are cached in whole to make available any updated files for future maintenance installations like repairs or installing additional patches. If the installation is successful, this file will remain in that location for all future maintenance installations including uninstalling the product. msp file – is copied to the Windows Installer cache under %WINDIR%Installer. msi file stripped of any embedded cabinets, or an entire. Whether or not a user interface is displayed, the primary portion of the installation – the only portion that should attempt to modify machine state – runs as a service. If Windows Installer did not delete these files, you can delete these files after installation has completed. That is, the package that is referenced using msiexec.exe or in a Windows Installer API call is copied to %TEMP% with a Windows Installer-generated file name even if the source copy already was in %TEMP%.

This copy is in addition to any temporary copy that might have been extracted to the local hard drive. Windows Installer uses this copy for initial disk space costs and through the UI phase until the installation script is to be generated. If this portion of installation – the client installation – was elevated, the %TEMP% location is for the user who authenticated and authorized the installation. msp files in the user’s %TEMP% directory.

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If a full user interface is authored in a package and is to be displayed, Windows Installer creates copies of the. If the source cache is deleted and source is required for any reason, Windows Installer may prompt for the installation source or simply fail to reinstall the product. Note that some installers may register these files as a source cache. If the extractor did not delete these files, you can delete these files after installation has completed.

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Bootstrap applications may also download files from a web site either directly to a location on disk or indirectly to the Internet files cache.

A bootstrap application may compressed setup files into the bootstrap application, or they might all be included in a self-extracting archive.

Extracted filesĪ bootstrap application may be required for a number of reasons. The following describes where and why Windows Installer may require so much disk space. But when upgrading or patching a product, most often those files are replaced so copies must be kept if an error occurs and the installation needs to roll back. When installing a product for the fist time, most often few or no files to be installed are already present on the machine. Windows Installer is an engine for performing transactional installations.