Yes, that's correct. Invision Power Board stopped being unlimited at version 2.0.0. Now you only have the option of buying a license or getting the limited version, which has tough restrictions.
You do realize using nullfied IPB is illegal and your x10hosting account will be suspended for it. There is a IPB 2.0(Trial) which is free and was released before IPB went pay only, it is free and legal and without limits.
Then why did you say Trial with it . And who doens't know using Nullified scripts are illegal. A few hosts accept Nullified ones. But blablablablabla, no illegal stuff here .