Manual Navi Update ECE A1 2025 to SD card breaks down with error

My Karoq still needs a manual Navi update to the SD card, so download the ZIP file from the update portal, then unpack and copy to the freshly formatted SD card. Unfortunately, unpacking the ZIP with a CRC error breaks in the file “maps\00\nds\PRODUCT\E1\ROUTING.NDS”. I have tested several downloads with different browsers, PCs, operating systems (Linux+Windows 11) and unpackers – without improvement. } Has anyone successfully executed the update? Thank you & G Rice