http://www.paris-travel-guide.info/eiffel-tower-tickets-advance/

eiffel tower advance ticket sale–top of tower?
i’m going to paris and wanted to buy an advanced ticket on the website for the friday that i’ll be there. however, it’s not showing any summit tickets available for purchase for any friday. it’s available for all other days of the week, but not for friday (or saturday, it seems). i was wondering if the summit is open on fridays, and that maybe you just can’t buy advanced tickets for fri/sat. it does let you buy tickets to the second floor, just not the top. i’m very confused! please help!!
As per the official Eiffel Tower website :
From November 4 to November 24 at 5:30 PM, the top of the Eiffel Tower will be closed to tours because of renovations. Visits during this period are limited to the second floor only and will be also opened on weekends.
If you go after November 24, you should be able to go to the top.
Have a great trip.
View from the top level of Eiffel Tower – Paris early afternoon