I only see one version of 1900ac available, so you might want to double check your router model to make sure you're using the right file. If you do have the right file, you can try getting an older build, the new WRT routers seem to have trouble flashing from stock Linksys with the newer builds, so try a file from April or somewhere around there, if that doesn't work just keep getting older builds until you find one that does work, when you get DD WRT installed you can upgrade to the latest build from there.
I only see one version of 1900ac available, so you might want to double check your router model to make sure you're using the right file. If you do have the right file, you can try getting an older build, the new WRT routers seem to have trouble flashing from stock Linksys with the newer builds, so try a file from April or somewhere around there, if that doesn't work just keep getting older builds until you find one that does work, when you get DD WRT installed you can upgrade to the latest build from there.
Thanks. Got it. You are correct. I needed to pay close attention.