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Zremesher plugin not found in 4R8?

I am using Zbrush 4R8

When I click on the zremesher button, I get an error message : sorry this function requires the zremesher plugin

when I install Zbrush 4R8, does the installation process also auto install zremesher plugin?

Or do I have to install zremesher separately?

How do I fix this problem?

Please help.

Thank you