That last bit is where the installer is registering keys in the registry and other areas and basically uninstalling itself.
Depending on the access the app you’re installing requires, that registration can be pretty time consuming (from our point of view).
This is *also* why the installation of many programs needs us to reboot our computers. Until that’s done, all the registration the installer did isn’t *finalized*. 9/10 it won’t cause any problems If you use that program without rebooting, but *sometimes* that 1/10 can seriously fuck your system up.
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