Hey Steve,
I private messaged you a link to get a copy of 4.03 from the MTU website for your records but you already have it.
JNS05 is correct, it sounds like you have the install file for 4.03. As far as upgrading to 4.05 from 4.03 (or visa versa) there is no need to do a system restore unless you are having system (computer) problems. The only reason to unistall 4.03 first when you upgrade to any version of Hoster 4 is if you are seeing a error (1706 error I think).
What I suggest is run the hoster403setup.exe and get 4.03 back on your computer then wait for 4.06 to be released.
I hope this helps.
Jim
