Read-only Powerpoint installation

I am looking to set up a computer to be attached to a large screen in a cafe and play a Powerpoint presentation on a loop. The intention is that it will not be internet-connected once set up. Powerpoint would only need to be read-only.

I looked into this before and tested the suggestions to create what is basically a 'powerpoint viewer' installation using the 365 installer (also for Word and Excel if required), and it worked in testing - basically a case of installing Office with an XML script which excluded everything apart from the required programs, them some manual config including registry changes.

For various reasons it didn't go ahead at that time but now (a couple of years on, probably) I need to look at it again. I documented the process the first time, but it now appears not to work. I give the steps below - of the registry changes, the first three appear to be having no effect as it's still asking for sign-in and showing as 'unlicensed'. I think the fourth one is working as the 'Share' button shows 'The service required to use this function is turned off. Check your privacy settings'.

Can anyone assist with this? Are these registry settings no longer valid? I have checked that I have made them according to the details below.

Thanks

Steps

• Create an XML script with the required programs (normally some combination of Powerpoint/Word/Excel) and carry out the installation (I give the script below)
• Create the following Registry keys:
  • HKLM\software\policies\microsoft\office\16.0\common\licensing!viewermode (DWord with a value of 1)
  • HKCU\software\policies\microsoft\office\16.0\common\signin!signinoptions (DWord with a value of 3)
  • HKCU\software\policies\microsoft\office\16.0\common\internet!useonlinecontent (DWord with a value of 0)
  • HKCU\SOFTWARE\Policies\Microsoft\office\16.0\powerpoint\DisabledCmdBarItemsList!TCID (String with a value of 26594) (this disables the share button in Powerpoint)
• In one of the programs (doesn’t matter which), go to File / Account / Manage Settings. Untick all options and OK

Installer script (company value removed, otherwise unchanged):

<Configuration>
<Add OfficeClientEdition="64" Channel="SemiAnnual">
<Product ID="O365ProPlusRetail">
<Language ID="en-gb" />
<ExcludeApp ID="Access" />
<ExcludeApp ID="Excel" />
<ExcludeApp ID="Groove" />
<ExcludeApp ID="Lync" />
<ExcludeApp ID="OneDrive" />
<ExcludeApp ID="OneNote" />
<ExcludeApp ID="Outlook" />
<ExcludeApp ID="Publisher" />
<ExcludeApp ID="Teams" />
<ExcludeApp ID="Word" />
<ExcludeApp ID="Bing" />
</Product>
</Add>
<Property Name="SharedComputerLicensing" Value="1" />
<Property Name="DeviceBasedLicensing" Value="0" />
<Property Name="SCLCacheOverride" Value="0" />
<Updates Enabled="FALSE" />
<AppSettings>
<Setup Name="Company" Value="XXXXXXXXXXXXXXXX" />
</AppSettings>
<Display Level="Full" AcceptEULA="TRUE" />
</Configuration>