I hope they start posting the amazon english links at some point. The site does not make it easy to find their music sometimes....

https://www.amazon.com/Caesura-Despair-Irys/dp/B098F38G8Z/ref=sr_1_1?dchild=1&keywords=%3ACaesura+of+Despair&qid=1626096476&s=dmusic&sr=1-1

It can take a bit, but usually they show up on the english versions of the sites like Amazon eventually. You may have to search for both the english and JP titles as it is inconsistent. Here's the US amazon link:

https://www.amazon.com/gp/product/B098F38G8Z/ref=dm_ws_sp_ps_dp

Edit: I just purchased this and unfortunately it says: "Pre-ordered Release day delivery: Monday, July 12, 2021" ... but it is the 12th amazon... Edit2: Now it lets me download.