I am not aware of a v2 download. v3 fixes problems that were in v2 and may fix your problem but I understand your hesitation. To be safe copy your USB files to your harddrive as backups. Then I would install v3 over v2 on the USB drive, safely remove the USB drive, reboot and retry it. If it doesn’t work you can copy the files backed up to the harddrive back to the USB drive.
hth