MultiTerm CU4 update

My MultTerm shows that there is an update v.1657 (Cumulative Update 4), but every time I try to install it, it fails. 
 
I've found a page that supposedly shows you how to install CU4 manually (https://gateway.rws.com/csm?id=kb_article_view&sysparm_article=KB0027510) but the links in the instructions at the bottom point to the wrong files (CU3 and SR1).
 
Could anyone help?