When I tried to install Zabbix 4.2 using Zabbix 4.2 zabbix-release package for SLES(zabbix-release-4.2-1.el12.noarch.rpm, zabbix-release-4.2-1.el15.noarch.rpm), I could only install 4.0.
After checking the contents of the zabbix-release package, the repository path was the path for 4.0. If you do not change to the path for 4.2, you can not install Zabbix 4.2.

Steps to reproduce:

1. Install zabbix-release package for SLES 12 or 15
2. Install zabbix-agent package

Result:
Zabbix 4.0 package is installed

Expected:
Zabbix 4.2 package is installed

wrong repository path:

# /etc/zypp/repos.d/zabbix.repo (SLES12)
[zabbix]
name=Zabbix Official Repository
type=rpm-md
baseurl=http://repo.zabbix.com/zabbix/4.0/sles/12/x86_64/
gpgcheck=1
gpgkey=http://repo.zabbix.com/zabbix/4.0/sles/12/x86_64/repodata/repomd.xml.key
enabled=1
update=1

right repository path:

# /etc/zypp/repos.d/zabbix.repo (SLES12)
[zabbix]
name=Zabbix Official Repository
type=rpm-md
baseurl=http://repo.zabbix.com/zabbix/4.2/sles/12/x86_64/
gpgcheck=1
gpgkey=http://repo.zabbix.com/zabbix/4.2/sles/12/x86_64/repodata/repomd.xml.key
enabled=1
update=1