Did you switch to record to SD card? If not, your recording is on the internal storage on your AC. Connect the included USB-C to USB-A cable between your AC and PC, power up the quad and you should be able to see your images.
SD card needs to be formatted FAT32/exFat32 (depending on size). If it was formatted/preformatted NTFS, that won't work. Best to format it from the Go App with the SD installed on the AC.