Sorry for any confusion.
There is no need to delete anything.
All I was trying to emphasis was that the program you are using to unzip the beta does overwrite the file(s) if it already exists.
Sometimes people make the mistake of answering "NO" to overwrite, when they should be answering "YES" to overwrite.
I installed the beta 4.45 and still have the same problem. The restart feature doesn't work. Also, everytime I reboot the computer I get a "always ask before opening this file" message, which is annoying. I uncheck the box but the next time I reboot I get the same permissions message. Thanks.