Install RAIDar on Mac OS Catalina

Hi,

I am trying to recover an old Readynas. But prior to that, I need to install Raidar as you know already (on a Mac OS 10.15.7 Catalina).

So I am downloading the installer dmg from https://kb.netgear.com/20684/ReadyNAS-Downloads . It turns out that I need to install OpenJDK or any JRE in general, from v7. Here comes the problem. I already have a JRE installed! 

⋊> ~ java -version
openjdk version "16" 2021-03-16
OpenJDK Runtime Environment AdoptOpenJDK (build 16+36)
Eclipse OpenJ9 VM AdoptOpenJDK (build openj9-0.25.0, JRE 16 Mac OS X amd64-64-Bit Compressed References 20210311_66 (JIT enabled, AOT enabled)
OpenJ9   - 022d65424
OMR      - 09514431e
JCL      - 0c11227a21a based on jdk-16+36)
⋊> ~ echo $JAVA_HOME
/Users/robertolo/.sdkman/candidates/java/16.0.0.j9-adpt
⋊> ~ 

I have tried other java versions + providers, but it does not change anything. Could you please help me? Thanks.