Hi Albert,
We have the solution. It appears it is an issue with the Eclipse cache relative to this RTD package. Please delete the following directories and try again. It should resolve this issue for you. It worked in my case.
<Install Dir>\S32DS.3.4\eclipse\p2\org.eclipse.equinox.p2.core\cache\
<Install Dir>\S32DS.3.4\eclipse\p2\org.eclipse.equinox.p2.repository\cache\
Please try it and let us know the result.
Best Regards,
Mike