Modifying the URL of a data source to get all historical data.

So I have this url that is connected to an investment index site. 

https://app2-nv.msci.com/products/index-data-search/regional_chart.jsp?asOf=22/Feb/2024&size=Standard%20(Large%2BMid%20Cap)&scope=R&style=None&currency=USD&priceLevel=STRD&indexId=990300&indexName=EAFE&suite=C

I want to modify this url to collect all the data available.  The site has a drop down to select all available data however when you do this the URL doesn't change so it forces you to manually download.  I have looked at the source code of the page in search of a different url but I'm not that experienced with that kind of stuff.

I have attemped to modify the URL with some success however I can't get the complete date range...

This link goes to Dec 31, 2020 to Feb 23, 2024 (Today)

https://www.msci.com/end-of-day-history?chart=regional&priceLevel=0&scope=R&style=C&asOf=Dec%31,%202024&currency=15&size=36&indexId=108

This link goes to Dec 31, 1969 (the Inception date which is what I want) to Jan 01, 1999

https://app2-nv.msci.com/products/indexes/performance?chart=regional&priceLevel=0&scope=R&style=C&asOf=Dec%2031,%201969&currency=15&size=36&indexId=108#

I just can't seem to figure out how to tackel this.  Has anyone else run into this problem?  Also, this complete data is not available on other websites as I have looked.