The JWs do not “discourage” you from having a library in fact you are encouraged to have one. But when it comes to try to obtain these books it’s not easy and the Headquarters and Bethels (UK and Australia) at least from my personal experience did not help in this although every year they are donated with libraries of members who passed away or decided to hand them to the Branch.
They told us that they will keep our request on their file but nothing ever materialize. We obtained our old books (Russell & Rutherford era) through asking directly old timers in UK and during holidays in England. As well buying them through second hand bookshops.