TIP: Make sure Internet Explorer is closed – we are going to start it as local system and if you have it running already it will get confusing as to which window is which user! And yes, I know its Internet Explorer – but I know the path this is installed to, whereas other browsers on your machine may be local or machine installed and that may not be accessible to Local System.This opens a cmd prompt running as the local system account – this is an admin level account and this tool can be used maliciously as well, so if your AV has an issue with this (or the exe somewhat fails to run) you need to exempt this application from the AV for a bit.Run the following: PsExec.exe -s -i cmd.exe.Open an admin cmd prompt to this folder.Unblock the download (properties of the file, check Unblock).
So how can you see what is going on? You need to connect to the Internet as the Local System account and the following steps will walk through this: The Local System is being blocked with an error message or an authentication prompt that it does not understand – it is trying to download Office and expecting to get Office! So if you find that Office (Microsoft 365 Apps for enterprise|business) will not get past 29% and if you look in the installer log in c:\windows\temp you might find references to “unexpected response” or “file corrupt” or words to that effect. One option is to use the Office Deployment Tool and download the files to a file share and deploy from the file share – but that needs everyone in the office and that is really not happening at the moment. So, if you have firewalls with URL restrictions or proxies that require authentication (for example, so I have a list of them here for search engines, ZScaler, ForcePoint, Umbrella, Bluecoat, McAfee etc) then you might find that you (the admin) and the users on the machines on your network can browse the internet fine, but the installer service just cannot install because it cannot download.
It is this service, running as Local System account that actually does the installation and the updates. Both of these tools require run as admin, and they create a new service called “Microsoft Office Click-to-Run Service” (ClickToRunSvc). The subscription software comes as a download from or is deployed via the Office Deployment Tool (setup.exe) and an xml configuration file. Microsoft Office 365 client software (Word, Excel etc.) has been available as a subscription model for over ten years and using the Click-2-Run technology for all or most of that time, but I still see a lot of people who are unsure how it actually works, assuming its a standard installer they have used for years – its not!
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