Unable to download?

I am not 100% sure what you are asking.

Based on the title “unable to download”:
There is a link to current and past versions on the ‘developers’ tab on the wordpress plugin page about the plugin. There is also a download link on my website here. From the plugins sections of your wordpress installation you can install directly after a search for ‘related links blender’.

Based on “How to link pages and websites”:
Once installed you need to turn in on in the settings for the plugin (settings->related links blender) then on each page or post add some links using the meta information pane just below the editor pane for that window.

Hope I have answered your questions! Let me know if you need further help.