No luck with installing Lightroom 6

Purchased lightroom online from Adobe.com about  three hours ago,

I have been using version 5(and automatic uploads of that) since it were introduced, and before ethat time version 4, and 3 etc.

During the process this morning, after it were downloaded, it has, asked for serial numbers when trying to instal, I typed that in( for Lightroom 6) then asked for version 5 's serial, also that were typed in

After finding lightroom 6 on the desktop, I clicked on it, then I accepted the terms, were consequently a new window opened and asked to type in the password for my account, to make changes etc, but the pasword won't work, ??

Please help, cannot make Lightroom 6 run, as the process won't be completed ...

Thanks