As @blainec mentioned in the previous post, you have to configure the original wxsim-parser script.
And you need the WXSIM windows program running and uploading also.
These are the original Ken True stand-alone WXSIM scripts, without any modification. That way you can “drop in” a new version if Ken has an update.
And you can always test the original script,
http://newbeithweather.com/pwsWD/wxsimPP/plaintext-parser.php
and include it on a page in the menu. 
The only drawback is that you have to set the correct location of the plaintext file in line 133 of plaintext-parser.php 
$plaintextFile = '../../plaintext.txt';
This default setting points to the root folder of your website ( => newbeithweather.com/ )
It seems your plaintext.txt file is in http://newbeithweather.com/pwsWD/wdisplay/plaintext.txt Change the line 133 to
$plaintextFile = '../wdisplay/plaintext.txt';
The “…/” drops the file pointer from the wxsimPP/ folder ( were the wxsim script “lives” ) to the pwsWD/ folder
The “wdisplay/” moves the pointer up into that folder so the script can find the plaintext.txt file it needs.
Success, Wim