Just send in a support request, listing your new CC3+ serial number you got from Humble Bundle. Ideally, don't put it on your account, but if you have done already, that's no real problem either.

Here is the link: https://s3.amazonaws.com/aws.profantasy.com/alternate/HCC2_SetupAlt.zip

Please try whether this avoids the error message. I also recommend to manually unzip the file before running the included setup.exe.

There was an error in an early version of that setup. This has been fixed in the meantime. Please re-download the setup from your registration page and re-run it.

They are on the right hand toolbars, near the top.

If you need symbols to always be on top of others, you can also set up a second sheet (E.g. SYMBOLS TOP) and move/place them there.

Yes and yes. Working on it right now. :)