iTunes64.msi missing

Hi there, RSM47!
Thanks for reaching out to the Apple Support Communities! It sounds like you are having issues with then iTunes64.msi file being missing and I’m happy to help! Based on the error message you are describing, I recommend taking a look at this article with steps to follow If you can't install or update iTunes for Windows. This article will give you the best steps to troubleshoot your issue, along with what to do next if you continue having trouble with iTunes.
Take care!