Adding PostSharp to new projects, when it’s installed for some projects in solution.

Once PostSharp  is installed in  solution’s packages folder for some project(s), I often need to add PostSharp to another project in the same solutionSection “Adding PostSharp to your project using PostSharp HQ” of documentation described the process quite well.

[solution root ]packagesPostSharp.

Also you need to ensure that the project is checked out,i.e. not readOnly.