Just did a fresh install of 0.88
When trying to add a project, just get the "You don't have permission to access the requested page" error.
Then uploaded the files from sp1.
Then uploaded the files from sp2. Tried to run public/patch/patch.php?id=088-sp2, but there was just an error.
Still can't add projects.
Tried the SQL from http://www.projectpier.org/node/3030. Didn't solve the problem.