You can get OpenChain ISO 5230 for free from the OpenChain website: www.openchainproject.org

However, some people want to download the ISO branded document. No problem! That’s free too if you go to the right place.

You can get a free copy of ISO/IEC 5230 from the Publicly Available Standards page:
https://standards.iso.org/ittf/PubliclyAvailableStandards/

Direct download link (you need to accept some terms):
https://standards.iso.org/ittf/PubliclyAvailableStandards/c081039_ISO_IEC_5230_2020(E).zip

You can also get the standard for 58 CHF through the normal ISO shop via our Main ISO page:
https://www.iso.org/standard/81039.html