Opencore 10.15.4 installer auto updating to 10.15.5??

Hi,

I had a fully working hackintosh-

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Specs:

Opencore Catalina 10.15.4

• CPU: i3 8100
• GPU: UHD 630
• RAM: 8gb 2666 DDR4 Ram
• Motherboard: B360 WIFI Gigabyte

Me being silly i accidentally updated to 10.15.5 as soon as it came out (yeah i know i'm a noob) and as expected it broke and stopped working.

So i decided to reinstall back to 10.15.4 with what i knew was a 100% working USB to install it on but for some reason it didnt work.

After days of pulling my hair out installing countless different versions changing kexts etc i finally got the system booted without UHD 630 (running at 7mb) i checked the version and it's 10.15.5 so for some reason it is auto updating to the latest version even though im using a 10.15.4 install. Is there a way around this i am very new to hackintoshing but even after countless hours of research i still cant find the solution.

Hoping someone can help me out on this one it's driving my crazy.

Thanks in advance!