Looking for Eclipse plugins

Question

I have an Eclipse Luna installed on my computer. I installed Eclipse Neon, and when I first ran it, a window opened with the list of all the plugins installed on Luna, and it asked me if I wanted them installed on Neon. By mistake, I clicked on no. And of course now, it's not asking me anymore. So how do I do to get back this window?

I tried the import application install wizard but I couldn't progress:

Answer 1

You can do this via File -> Import.

Select Install, then From Existing Installation

After browsing to an old Eclipse installation folder (Kepler in my case), you can choose which plug-in's to import.