1.)
pkgName for arm64 is "/OpenVPN_Connect...." but should be "OpenVPN_Connect..."

2.)
Suggestion to add appNewVersion to avoid unnecessary download and installation. Something like the following maybe:

appNewVersion=$(curl -fs "https://openvpn.net/client-connect-vpn-for-mac-os/" | grep -i "Release notes for " | grep -vx -m 1 '.beta.' | sed "s|.for (.) .|\1|")
or
appNewVersion=$(curl -fs "https://openvpn.net/client-connect-vpn-for-mac-os/" | grep -v 'beta'| grep -m 1 "Release notes for " | sed "s|.for (.) .|\1|")

2022-11-26 18:34:19 :: 1st-v9.6 :
2022-11-26 18:34:19 :: 1st-v9.6 : openvpnconnectv3
2022-11-26 18:34:19 : REQ : openvpnconnectv3 : ################## Start Installomator v. 10.0, date 2022-11-18
2022-11-26 18:34:19 : INFO : openvpnconnectv3 : ################## Version: 10.0
2022-11-26 18:34:19 : INFO : openvpnconnectv3 : ################## Date: 2022-11-18
2022-11-26 18:34:19 : INFO : openvpnconnectv3 : ################## openvpnconnectv3
2022-11-26 18:34:20 : INFO : openvpnconnectv3 : BLOCKING_PROCESS_ACTION=prompt_user
2022-11-26 18:34:20 : INFO : openvpnconnectv3 : NOTIFY=all
2022-11-26 18:34:20 : INFO : openvpnconnectv3 : LOGGING=INFO
2022-11-26 18:34:20 : INFO : openvpnconnectv3 : LOGO=/Applications/Self-Service.app/Contents/Resources/AppIcon.icns
2022-11-26 18:34:20 : INFO : openvpnconnectv3 : Label type: pkgInDmg
2022-11-26 18:34:20 : INFO : openvpnconnectv3 : archiveName: OpenVPN Connect.dmg
2022-11-26 18:34:20 : INFO : openvpnconnectv3 : no blocking processes defined, using OpenVPN Connect as default
2022-11-26 18:34:20 : INFO : openvpnconnectv3 : App(s) found: /Applications/OpenVPN Connect.app
2022-11-26 18:34:20 : INFO : openvpnconnectv3 : found app at /Applications/OpenVPN Connect.app, version 3.3.6, on versionKey CFBundleShortVersionString
2022-11-26 18:34:20 : INFO : openvpnconnectv3 : appversion: 3.3.6
2022-11-26 18:34:20 : INFO : openvpnconnectv3 : Latest version not specified.
2022-11-26 18:34:20 : REQ : openvpnconnectv3 : Downloading https://openvpn.net/downloads/openvpn-connect-v3-macos.dmg to OpenVPN Connect.dmg
2022-11-26 18:34:20 : INFO : openvpnconnectv3 : notifying
2022-11-26 18:34:48 : INFO : openvpnconnectv3 : found blocking process OpenVPN Connect
2022-11-26 18:34:51 : INFO : openvpnconnectv3 : telling app OpenVPN Connect to quit
2022-11-26 18:34:51 : INFO : openvpnconnectv3 : waiting 30 seconds for processes to quit
2022-11-26 18:35:22 : REQ : openvpnconnectv3 : no more blocking processes, continue with update
2022-11-26 18:35:22 : REQ : openvpnconnectv3 : Installing OpenVPN Connect
2022-11-26 18:35:22 : INFO : openvpnconnectv3 : notifying
2022-11-26 18:35:22 : INFO : openvpnconnectv3 : Mounting /var/folders/zz/zyxvpxvq6csfxvn_n0000000000000/T/tmp.EtLRERn4/OpenVPN Connect.dmg
2022-11-26 18:35:27 : INFO : openvpnconnectv3 : Mounted: /Volumes/OpenVPN Connect
2022-11-26 18:35:27 : INFO : openvpnconnectv3 : Telling app OpenVPN Connect.app to open
2022-11-26 18:35:27 : INFO : openvpnconnectv3 : Reopened OpenVPN Connect.app as savvas
2022-11-26 18:35:27 : ERROR : openvpnconnectv3 : ERROR: couldn't find pkg �/OpenVPN_Connect_[0-9_()]*_arm64_Installer_signed.pkg� in dmg OpenVPN Connect.dmg
2022-11-26 18:35:27 : REQ : openvpnconnectv3 : ################## End Installomator, exit code 20