We would like to upgrade Slack & Box through intune.we tried to upload a new MSI for Box with a newer version but getting error message Fatal error during installation (0x80070643)Do we first need to run a uninstall assignment and then push out a new assignment with newer MSI?Or is it possible to upgrade box without running uninstall assigment?
See whether you have more success with wrapping the Box MSI with the Intune Win32 wrapping tool: https://docs.microsoft.com/en-us/intune/apps-win32-app-management
Use the Microsoft Store for Business to deploy Slack instead: https://businessstore.microsoft.com/en-gb/store/details/slack/9WZDNCRDK3WP. No packaging required.
I was able to successfully update Box by uploading a new MSI and setting the 'ignore app version' toggle to 'No,' without any uninstall assignments. From my experience, it is possible, sorry that doesn't shed light on your error though.