I recently purchased a Houdini Apprentice HD license, but I cant seem to get Houdini to read the license.

I manually entered the 3 keys along with a server key and I still start up in the regular apprentice version, with the watermark and all.

Has anyone experienced this problem??

Ok, it looks like my server key license server host name doesn't match the name on my license key, any way to reset this

you will need to rename the machine name to the name for which your LICENSE keys were issued.

If the server code has changed, you can use these steps to reinstall the SERVER key:
http://www.sidefx.com/index.php?option=com_content&task=view&id=1208&Itemid=273#reinstall-server [sidefx.com]