Odd. Others with 10.9 have not reported any problem. Are you running as the Administrator on that system or just a user?
Even when you extract the downloaded .pkg file it can't be found? Try running the .pkg file and before closing the installer, check the installer log file. In the meanwhile I will look for a hint about the cause online.
Developer, Bible Analyzer
But to him that worketh not, but believeth on him that justifieth the ungodly, his faith is counted for righteousness. (Rom 4:5 AV)