Subclipse Integration for Mylyn 3.x (Optional) (3.0.0) requires plug-in "org.eclipse.mylyn.tasks.core (3.0.0)", or compatible. error sometimes appears when installing SVN,
it doesn't matter
Solution one:
Just uncheck the Integrations item of the first box.
Once installed, it is ready to use
Solution two:
Uncheck Subclipse Integration for Mylyn 3.x in Subclipse (Optional)