Winrar can open 7zip files and the free trial lasts forever.
Luma3ds Troubleshooting/FAQS
ShellyCreated:
https://3ds.guide is a guide that is constantly updated by multiple people, is incredibly detailed and has specific instructions for new/old 3DS as well as different software versions, and is well established and trusted in the 3DS hacking community as the definitive guide. I'd recommend following that instead of the one in this thread.
http://www.7-zip.org/ can open 7zip files too and it's completely free.
http://www.7-zip.org/ can open 7zip files too and it's completely free.And the 7zip format is objectively better
Also 7-zip is faster than winrar.