Hi, we have an similar issue, so i use this old "case".
Anti-Malware is updating just fine, but Anti-Exploit keeps the old Version 1.09.2.1291,
only the unmanged, stand alone PCs are updating correctly, but none of the managed PCs...
Today we updated the Server to "Malwarebytes_Endpoint_Security_1.8.13.0000" , generated the Installation package for the Clients,... but nothing changed, every managed client has the same old Anti-Exploit-Version.
In the Serverlog you see only "Anti-Malware signature database has been updated, version v2018.06.26.03 and so on, nothing to see from Anti-Exploit or anything else beside Logins.