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Do you get a message when trying to launch Houdini asking if you want to “install” (seems like a poor choice of words, but oh well) a free, non-commercial license, or something like that?

no, it didn't. i've just installed apprentice as usual.. I attached pictures of the window message when i launch Houdini 12.5 and my Houdini license administrator, i hope it can help to know my problem

I read “We are phasing out our support of Win XP and Vista but will continue to provide support for Houdini on Win 7 and Win 8”…

Well, the problem is i'm not using win 7 and win 8 yet, i still use win XP 32 bit. Does Houdini 12.5 Apprentice version can run on win XP or not? i try to install the Houdini 12.5 Apprentice Version for win 7 32 bit on my computer. It ran, but after installation completed and i try to launch Houdini 12.5, window message appears “License Error: Unable to connect to hserver for license acquisition”. Does it mean, it doesn't connect to hserver for license acquisition because i use win XP?

I'll download the new daily build. i wish that will solve my rendering problem in Houdini Apprentice. Thanks to Side effects