It is highly unusual for an msi installer to go missing from the Installer cache. Many, but not all, situations where this issue occurs are related to the use of third-party "uninstaller" or "registry cleaner" applications. It's important to note that Microsoft does not endorse these third-party applications
. Moreover, Veeam's software is not tested with these applications, and therefore, cannot predict the potential long-term negative impacts of their use. As a result, we strongly advise against using these applications to uninstall Veeam software or clean the registry of a machine where Veeam software is installed.