Unintentional upgrade- can't get past plugins check

I was trying to install a plugin into my moodle site (2.6.7 i think), however when I clicked install it brought me to this page here:

sorry for the unnecessary space. 

Now i've installed all the add-ons needed to make the plugin work, but it wont let me continue past this page. I can't cancel the upgrade even though I didn't choose to upgrade the system. I can't go to any other page and if I click continue I just get redirected to the same page.

I'm at my wits end, really don't know what to do. I'm not that tech savvy either so I'm not familiar with editing code and the like, but I do have someone who could potentially help if the solution comes to that.

Thanks.