This really isn't happy experience for this upgrade. I followed all the instructions. I have made SSH enabled and used putty to access my store host. After executing the command of " for i in `sed -e 's/,.*$//g' < upgrade/4.1.9-4.1.10/file.lst`; do chmod 666 $i ; done", I started to login as admin from the bakc-end of my store. But I was rejected and got the following error message:
500 Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator,
webmaster@yueteki.com and inform them of the time the error occurred, and anything you might have done that may have caused the error.
More information about this error may be available in the server error log.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
When I contacted my store's host, I was told that the host (hostmonster.com) does not allow such a global writing permisssion. I have no way to go. Really a terrible upgrading experience.