How to use UB instant Layered Navigation ?

Hi King Ling,
Our team is having a 3-day holidays starting from July 14, and our office is closed at present.  
 
We know it’s not the right time to ask for delay in response to your question. We’ll get back to you as soon as possible next Monday. 
 
Thanks for your understanding and patience. 
 
Sincerely,
Ubertheme team

Hi king Ling,

[Exception]
Notice: Undefined offset: 0 in D:\Phpstudy\WWW\app\code\Ubertheme\UbLayeredNavigation\Helper\Data.php on line 555

To solve the issue as you mentioned, kindly do following steps:
-- Step 1: If your Magento is production mode, please switch to default mode or developer mode by CLI command:
php -f bin/magento deploy:mode:set developer
-- Step 2: Open the php file at path app/code/Ubertheme/UbLayeredNavigation/Helper/Data.php
and find to the code line:

$value = $values[$matchedKey];

and replace it by code line:

$value = isset($values[$matchedKey]) ? $values[$matchedKey] : null;

-- Step 3:

• Open your terminal and run commands to update new changes: rm -R var/* pub/static/*
• Once done, kindly rerun the CLI command:
  • php -f bin/magento ub-layerednav:export:run

And tell me know how it goes.
Regards,
Mall.