Find installed O365 apps version
To find version on single machine:
Get-ItemPropertyValue -Path HKLM:\SOFTWARE\Microsoft\Office\ClickToRun\Configuration -Name “VersionToReport”
To find version on multiple machines:
Invoke-Command -ScriptBlock {Get-ItemPropertyValue -Path HKLM:\SOFTWARE\Microsoft\Office\ClickToRun\Configuration -Name “VersionToReport”} -ComputerName PC1,PC2,PC3