El Capitan Web installer on Dell Dimension E520 gets stuck with white window after logging in

Hardware is as follows:

Motherboard/PC: Dell Dimension E520

BIOS Setup: SpeedStep - On; Virtualisation - Off; HDD Mode - RAID/AHCI

CPU: Intel Core 2 Quad Q6600 [Kentsfield]

GPU: PNY GT 610 [1GB DDR3]

RAM: 2x2GB + 2x1GB DDR2 [6GB]

Install Method: Legacy OpenCore 0.6.5 using FAT32 USB made with Diskpart + BOOTICE

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Trying to install El Capitan (which is the last macOS to work with non-SSE4 CPU's like my Core 2 Quad) functions correctly until after logging into an itunes account - after which it simply displays an empty window with nothing in it; closing it causes the installation to stop

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Any ideas?

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