Finally managed to rectify the issues present in 10.15.4 with Catalina Patcher. Patcher version 1.3.5 has just been released, which has full support for 10.15.4. http://dosdude1.com/catalina
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I just downloaded the patcher today, and it gets stuck in the Apple logo too.
It's a MacBook white late 2009.
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Thank you for the Catalina download video for a Mac. Question, I didn't do a backup of my High Sierra OS and now I can't access it. Do you have any suggestions?
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Well, of course, once you upgrade the OS, the OS is upgraded. The only way to revert back is to make a High Sierra installer, boot from that, erase your hard disk, and install.
End of conversation
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I'm applying patches again through the 10.15.4 installer again, but isn't working...
Thanks. Twitter will use this to make your timeline better. UndoUndo
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I'm just updating this thread: I just applied patches through the USB installer and it works. You can't imagine how happy I am
Thanks. Twitter will use this to make your timeline better. UndoUndo
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It took me three days and one night to get a bootable USB with macOS (I tried a lot of times and it never appeared in the boot menu
) thank you for updating the patcher 
you're a genius, manThanks. Twitter will use this to make your timeline better. UndoUndo
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I downloaded the patcher around 5 hours ago on a fresh installation on macOS (I needed to create a virtual machine on Windows to create a bootable USB of supported macOS and install again).
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Install transmac on Windows, no need to VM.
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