After reinstalling AS7 after screwing around a bit it appears that the toolchain can no longer be found. I uninstalled all Atmel packages on my PC a few times after seeing this error so try and get a fresh install, but it doesn't seem to help at all.
When trying to open an older AS7 project:
C:\Users\Ryan\Documents\Arm_Projects\App_7\App_7.cproj : error : Required toolchain is missing or corrupt. Please repair Atmel Studio installation from 'Add or Remove programs'.
If I create a new project I get the following:
I don't currently have any Studio 2015 packages larger than 20MB, is it perhaps that I am missing some of these?