SYMPTOMS
I am see warnings similar to the following after running the install.php

Warning: fopen(../data/security.php): failed to open stream: No such file or directory in /home/public_html/yourdomain/install.php on line 12

Warning: fputs(): supplied argument is not a valid stream resource in /home/public_html/yourdomain/install.php on line 13

Warning: fclose(): supplied argument is not a valid stream resource in /home/public_html/yourdomain/install.php on line 14

Warning: Cannot modify header information - headers already sent by (output started at /home/public_html/yourdomain/install.php:12)
in /home/public_html/yourdomain/include/common.function.php on line 26


CAUSE
The file permissions in the data folder are incorrect. Windows must allow modify, read and write. On Unix/Linux all files should be CHMOD 777.

SOLUTION
  1. Create a security.php file in your data folder (a blank text file)
  2. Give the file and folder Read/Write (777 unix) Permissions
  3. Log into your BCP
  4. There will be a yellow bar informing you that there is a new system file (see image below)
  5. Click it and wait (it can take a few minutes)