Learn English – Word for ‘one who steals books’

In practice the normal term would be installer, but configurer and configurator could be used. I think most people would understand these words, even though they don't normally use them.

There is no such single noun that I am aware of. We might say the one stolen from or the victim.

Colloquially you could find terms like the mark or the patsy but I would not recommend using them except under restricted circumstances and informal usage.