Installing Anaconda3 on ARM64/aarch64

I am trying to install Anaconda3 under Manjaro Linux on an ARM64/aarch64 SoC with 8Gb RAM and 128 Gate memory using the Anaconda installer with the aarch64 2021.12 script as per the instructions on anaconda.com.
When I run the bash script I get an “illegal instruction” on line 408 and the script terminates.
I’ve looked at the instructions with a text editor but I can’t see the error.
Can anyone help with a correction to the script or an explanation as to what is happening please?