You shouldn’t really listen to anyone here. The answer is that it’s implementation dependent. Maybe the engineer wrote it so that there are four steps of 25% each. Copying files is maybe step 1 and is super fast. Step 2 is a big database operation and is slow… etc.
Maybe the steps are totally fake. Maybe there is a simple timer that moves the progress up 10% every second until 99% where the last percent is actually dependent on something.
Its completely unique to the person who programmed it or a commonly used installation software.
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