Installing gwt on RAD 7.5

Hi All,
I am new joined to this group,
I need to install GWT plugin on rad 7.5 but getting error for mylyn
plugin requirement message.
So, as explained here i am adding this link to find and install--
>software remote site
"http://download.eclipse.org/releases/helios"

but it cannot import the site pakages,
I want to ask if installing gwt on rad 7.5 is possible?
if possible what is the path that i need to follow?

Thanks in advance.

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