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The source of the problem are corrupted disk permissions.
To fix this issue, please try the following:
1) go to YourMac > Library > Plug-Ins > FxPlug folder and delete the "mLut.fxplug" directory,
2) go to YourMac > Library > Application Support> mLut folder and delete the "mLut Download.app" and "wn" files,
3) go to YourMac > Users > YourUserName > Movies > Motion Templates > Effects folder and delete the "mLut" directory.
After that, empty your trash and restart your Mac.
Lastly, launch mInstaller and install mLUT plugin.