Problem when downloading mods for Skyrim through the NMM (Nexus Mod Manager)


When trying to download two mods (the most recent Apachii Hair Mod and a Dagi-Raht race mod) I got this error message:

A problem occurred during the install
The execution has failed due to the bug in the SevenZipSharp.
Please report about it to http://sevenzipsharp.codeplex.com/WorkItem/List.aspx, post the release number and attach the archive.
The mod was not installed.

I am absolutely not tech savvy and really need help in knowing what do now. Please help! I am also very unfamiliar with this website. What does it mean by "post the release number" and "attach the archive"?

Tysm, I suck with computers but I love this game.