I'm a technical author and I can assure you that using 'you' is fine and I believe it is included in the Microsoft guide on documentation standards. Keeping the copy impersonal is decidedly 'old school' and can cause problems, particularly in countries where people are likely to sue at the drop of a hat (i.e. America).
The use of 'you' makes it absolutely explicit who is performing the action described, and that's the best argument for including it. It eliminates ambiguity.
I work for a major international company and the use of 'you' is required as part of their quality policy. The documentation is used in countries all over the world and it is for a highly technical engineering product. There is no benefit to not using 'you' other than it makes a company appear more corporate.
Some people just think documentation has to be very formal and be almost academic in style...that's just bad practice in my view. The easier the documentation is to read and understand, the more effective it is. Simple as that.
I hope that helps!
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