Trying to automaticaly update PowerPoint data linked to excel using VBA

Hello,
I'm looking for a way to create a PPT where I'll leave it all day along on presentation mode and the data that is linked to it(from Excel) to be updated without using a button that's displayed on my presentation.

I saw that there is an Add-on that exist but it's not free. Thank you if you try to help me !

Best regards.