It rebooted, and the installer continued installing. I then went through the installer (selecting my main drive that I just converted to APFS to install). When that process finished I exited Disk Utility and clicked on "Reinstall macOS". I then booted to the bootable external USB drive I created, went into Disk Utility Unmounted my main drive (the one with OSX 10.11.6 installed and running on it) and converted the Disk to APFS. I followed his instructions for creating a bootable external USB drive (and per instructions I made sure that the drive passed verification). I started off by downloading the most current 10.15 Catalina installer from his website. (I had to swap it for the original graphics card because I needed access to the boot selector screen) this becomes important. **NVIDIA GeForce 8800 GT Graphics Card** - NORMALLY I run an NVIDIA GeForce GTX 750 Ti SC (EVGA brand) windows graphics card and use the NVIDIA web driver to make it work. Hi everyone, after thinking about it for way too long, I finally decided to upgrade my unsupported MacPro 3.1 from OSX 10.11.6 to macOS 10.15 and I think I messed everything up. So no, you're not alone!? (SOLVED, see update above) I thought I was going nuts, and thinking it may be my machine or its GPU I created my own thread asking for help earlier this weekend. Looks like either something might have changed in the latest version of "Install macOS Catalina.app", and/or something is hinky with the Patcher app (or the download, I re-downloaded this many times as well). Unfortunately, Catalina Patcher has so far not managed to even create a bootable USB medium, let alone install a working copy of Catalina that would boot my cMP. I've tried at least a dozen times on two different machines (cMP5,1, MBA4,2) with three different USB sticks (all SanDisk, two of them brand new), SATA SSDs and spinning HDs internally in the cMP or in external three different USB enclosures, with two different GPUs (old Radeon 5770 and RX580) – and, zilch. I've downloaded "Install macOS Catalina.app" at least eight or nine times over the last 24 hours (yay for Gigabit internet!), I've checked the checksums for "InstallESD.dmg" and "BaseSystem.dmg" - they're correct.
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