matlab version R2018a as a trial

I have a mac OS X El Capitan, which is not complatible to the latest version of Matlab. Is it possible to download matlab version R2018a as a trial? I did not see the option to choose the version of the matlab according to the link that given. Thank you

[Walter Roberson]

you would need to contact Mathworks Sales

[Nurina Firiani]

Thanks for the suggestion.