I'm trying to download and install Mojave. I've put in a metal GPU that's compatible. I've already done this on my 2nd MacPro successfully. This one is problematic, but it's more complicated. I had taken out the SATA III PCIe adaptor for the SSD to update High Sierra for the basic Boot Rom 138.0. I put them back in (the GPU and PCIe/SSD. I go to the App Store and hit download. It starts. Scroll bar gets to within 1/8 finished. The scroll bar or any indication that it's continuing to DL. It appears to just stop. Is this normal? Is it continuing to download in the background or has it actually stopped? Is this a bug? Or is it expected behavior? Am I just anally impatient?