Website not reachable
This is caused by Apache’s Stack Size, you can either increase the Stack Size or disable the function which causes this.
Increasing the Stack Size
Add the following code to your httpd.conf and restart Apache:
<IfModule mpm_winnt_module>
ThreadStackSize 8*1024*1024
</IfModule>
Disabling the Function
Open merge/index.php and search for:
define("SKIP_ENCODING_DETECTION", 0);
Replace the 0 with a 1.
Attachment Permissions are Wrong
This is most likely caused by a .htaccess file that denies access to the attachment directory.
Normally the .htaccess is located either directly in the attachment directory or in the root of your old board. After you rename the .htaccess file to something else, you can reload the merge system.