Firmware downloads BUT remains with target fw not found locally
Thanks for sharing back. According such I can confirm firmware download is successful and you’re right sounds extraction process is failing.
Weird stuff is if any fail at any step of firmware setup you should get a pop-up dialog providing you some reason / error code about such fails.
If not ... let’s first have a look to some past discussions we may have :


As workaround as far as sounds you’re able to get firmware zip file locally, let’s copy and unzip it under C:\Users...\AppData\Roaming\Ac6\SW4STM32\firmwares (as Standard peripheral firmware type both .zip & extracted material are required at same place to allow firmware finder process to succeed).
As side short notice: Hardware Abstraction Layer firmwares which are most up to date firmware packs (recommended ones by the way as fully supported) are promoting smarter packaging ... if no specific reason to rely on Standard Peripherial material I would suggest you to rely on HAL ones.
Br,
cartu38