I used to have Zwift (the actual game app, NOT the Companion) on my iPhone (SE2) about 2 yrs ago without problem. Removed it sometime back, and now trying to re-download it back on my phone. The download starts, but after ~30% completion on the progress icon, the download would exit out showing the download icon again (cloud with a down arrow).
available space = 26.46 GB
A search of forum showed download issue in the past with iOS12 (circa 2020) that was resolved. This seems like a new bug.