Hi,
Run PREFETCH from command line, select all and delete, and delete all files and offline content in IE then reboot.

>>>EULA that comes with SP1 still says 'Beta':
>>
>>No it is only happening to you and probably not others. This is a caching issue on your machine from previous betas of SP1. You might try clearing your cache, downloading the EXE file to your hard drive, then running it again.
>
>Which cache you're refering to? I checked installation log and EULA is comming from iside of instalation package not from external file.
>
>BTW, Ir's EULA that is shown during install. The one disk is correct.