Very easy! Simply download them from Google Drive, unpack, select the files and drag and drop into your phone in file explorer. After that, you can browse them in Sounds > Ringtone.
A FEW WORDS
“Apple has prioritized technical performance over creativity in their iPhone development. Stock sounds have been repeatedly used, resulting in untapped potential for our speakers. To address this, I developed the concept of creating ringtones that corresponds to the current desired frequencies.”