Ubuntu script return error

Hello,

I just downloaded Ubuntu installer. And tried to install by:

sudo sh ./gpa_19.2.343286_release_m64_deb_install.sh

However, it returned the following error:
./gpa_19.2.343286_release_m64_deb_install.sh: 3: ./gpa_19.2.343286_release_m64_deb_install.sh: Syntax error: "(" unexpected

Is there a place I can download old release?

Thanks.