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i mean after i downloaded it and when i start it up it says failed to obtain serial number from ntitles server and sorry for wrong place its my first time on this site
protexis.com , email their support, they will ask some questions, anwser them and you will get what you need. And like Larynni said, wrong section. What made you think "Project Discussion" rather than say some sort of help thread was the proper place for this?
Try being online when starting up RMXP, if you have Vista open up the program's properties and find the checkbox for "Run in administrator mode". Hope this helps.