Also, you can uninstall and reinstall without any problems. However, I am not confident it will fix the Recredential Database issue. The reason why I say this is because by the time Recredential Database executes, the install has completed 'successfully' and is now running an external process to set security on the AMAZINGCHARTS SQL instance and your database. The reason I force the install to fail if Recredential fails is as I described above, without the security set correctly, Amazing Charts cannot read your data.
Also, I understand that 'setting file permissions' is a pain, it is a sore spot for me that I wish I could make better in the upgrade experience. The more files in sub-directories, the longer setting file permissions takes.
