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Question:When I install XLSTAT, an error message pops up saying "installed service version is not valid". How should I proceed ?Answer:First close XLSTAT and Excel.In the XLSTAT installation folder, you should find a file called nlsinst.exe.Right click on the file and select “Run as administrator”Follow the installation process.Once the process is over, run XLSTAT and try to activate your license again.If the same problem occurs, please reboot your computer.
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