Error while installing Sage 100 2016 Product Update 4

I'm installing Sage 100 2016 Product Update 4.

At the end of the migration routine I get an error:

Prepare failed with the following error:

Cannot delete E:\Mas\Sage100_2016\MAS90\Providex.KDFŠ0.

There's no obvious reason why this would do this. I need help figuring out what could cause this issue.