I am unsure what's causing the installer's script files to not be copied into c:\p-roc\scripts and it's very weird that this has been working for others but not for you. Let's try to figure out why. What version of windows are you running and is it 32 or 64 bit?
As for just merging dev into master, that was our first thought, however it doesn't fix the DPInst 64 and cc1/zlib errors that had developed when running the old installer on a 64 bit machine.
Let's try to track this down further and in the worst case I can just email you the scripts. I'd love to figure out why this isn't working for you though, in case if happens to someone else, too. I'm off to ask google to see if there's any precedent for this.