Specific modern applications can keep old installers and similar programs from running.
An example are 32-Bit Setups not starting. Usually they can be found running but not progressing in the Task Manager. (As is the case here).
It is extremely likely that another process is causing this hang-up because the Setup is "waiting for it".
Here is what you can do:
On Windows 10 the Task Manager has a feature called "Analyze Wait Chain" on the "Details" tab to find out what program the hanging process is waiting for. So open it up, move to the Details tab and rightclick