Following the proper upgrade instructions in the docs folder of each zipped file will tell you that the only time you need to copy older or edit newer configure.php files is if the 1.5.0 installation fails to create the configure.php files.

You might want to read through those again. Trying to give cliff notes generally results in omissions. EVERY time I install or upgrade, I review the instructions and follow them to the letter. Using a cheat sheet, auto-installer, or any other "shortcut" just leads to hours spent trying to correct errors.