This is very weird.
Are you sure that you deleted the .htaccess file completely? If yes, try clearing the browser cache. Something must intefere with the URLs…
Finally got through most of the set up and then received this:
A Database Error Occurred
Error Number: 1118
Row size too large. The maximum row size for the used table type, not counting BLOBs, is 65535. This includes storage overhead, check the manual. You have to change some columns to TEXT or BLOBs
CREATE TABLE ip_client_custom_new ( client_custom_id INT NOT NULL PRIMARY KEY AUTO_INCREMENT , client_id INT NOT NULL, client_custom_fieldid INT NOT NULL, client_custom_fieldvalue VARCHAR(65535) NULL , UNIQUE (client_id, client_custom_fieldid) );