Script for processing data from a web page (Consultation)

Good afternoon, 
I would like to get an opinion / consultation on possible solutions to the task (phone call / Telegram / WhatsApp). I can show live how it currently works through AnyDesk. I will answer any questions.

Task: Extraction and processing of client data for generating addresses in CSV format.

The "Afterbuy" system (CRM for order processing) is used to generate documents (invoices for orders). Data is exported through templating with placeholders for dynamic substitution of order data.

Document generation process:

In the CRM (Afterbuy), there is a customizable template for documents (invoices, bills). This template contains placeholders (for example, <-Street-> for the street) for dynamic insertion of the corresponding data. Upon request, the generated data for documents is sent to an external server via a script embedded in the template. The script on the server processes the received data and generates a CSV file with addresses. After processing, the results are displayed in a new browser window. Users have the opportunity to view the newly processed data and save the generated CSV file.

Current issues:

• The script does not work in new versions of browsers.

• Inability to modify the data processing process (for example, correcting addresses using algorithms or artificial intelligence).

Assignment (questions for the specialist):

• Alternative methods or technologies to optimize and improve the security of this process?

• Is it possible to minimize dependence on the browser?

• Include AI in data processing?

• Improve the implementation or redo it through parsing or API?

• Alternative: download "raw" CSV and process it (desktop or create an online service).

The code that calls the script (Smarty tags - a compiling template handler for PHP):

<-if <-PCounter-> = 1-><style type="text/css">
body {text-align: center;}
#ABinfo {
 text-align:left;
 margin:10px auto;
 padding:10px;
 width:800px;
 background:buttonface;
 border:1px dashed gray;
 font:normal 11px verdana;
}
</style>
<script type="text/javascript" src="https://XXXX/ABdata/ABdata" for="<-VKShopID->|ABdata|https://XXXX/ABdata/SCRIPT.php"></script>
<-end if-><div style="display:none;">
<-if <-PCounter-> = 1-><dl class="common" id="account">

(the following are all the necessary placeholders for the address, for example):
 
 <dd class="VKFirma"><-VKFirma-></dd>
 <dd class="Name"><-Name-></dd>
 <dd class="Surname"><-Surname-></dd>
 <dd class="Street"><-Street-></dd>
 <dd class="Land"><-Land-></dd>
 ...
</dl><-end if->
 
<dl class="vorgang" id="v<-Aid->">
 
  <dd class="VKFirma"><-VKFirma-></dd>
  <dd class="Name"><-Name-></dd>
  <dd class="Surname"><-Surname-></dd>
  <dd class="Street"><-Street-></dd>
  <dd class="Land"><-Land-></dd>
...
</dl><-RELOOP START->
<dl class="artikel" id="a<-SAid->" title="v<-Aid->">
 <dd class="Counter"><-Counter-></dd>
...
</dl><-end if-><-RELOOP END->
</div>

Thank you for your attention. 💙💛