My eternal gratitude to the devs!!! The installation experience was not smooth, but I managed to install Ventura on a macbook air 5.2 (mid 2012)!
View attachment 2123371
The process:
I downloaded the OCLP v0.5.2.
I chose to download the macOS from the OCPL menu (Create macOS Installer -> Download macOS Installer -> macOS 13.0.1 (22A400) - 12.2GB). After the download finished I got the error : "No Installers found in Application folder". I am not confident with macOS disk internals, so I did not manage to find where the downloaded file went, to see what is wrong...
So I manually downloaded the macOS from this link (mrmacintosh.com/macos-ventura-13-full-installer-database-download-directly-from-apple). When the download finished, I moved the ventura installation app file from "InstallAssistant.pkg" into Application folder.
I erased the usb flash drive with disk utility, using format APFS and Scheme GUID partition map. Then I tried to flash the ventura installer into the usb flash drive using OCLP. After about 5 minutes I got the error "The bless of the installer disk failed.". So after a bit of googling I decided to flash the usb via terminal.
The flashing via terminal was successful and I used the OCPL's top menu option "Install OpenCore to disk". I chose the destination to be the efi of the usd flash drive but I got permission error 1. I googled a bit and I found how to give permission to OCPL to access drives (apple icon menu -> System settings -> Privacy and Setting (iirmc)). After giving permission the installation to efi was successful.
I booted from usb, deleted the sdd with the old ventura OS and I made a clean ventura install. At some point I got the error : "an error occurred preparing the software update". Clueless I chose to select a start disk, there was none to select. I rebooted and I found a white page showing the charging icon (no os found I guess...).
I started again the clean install (deleting again the ssd) and eventually I got the same error. I rebooted but while pressing the option button, I chose again the usb efi to boot. I had lost any hope but eventually after many automatic reboots the new Ventura showed up!!!
Soon I realised that I cannot boot without the usb stick. So I downloaded the OCPL again (clean install I had to) and I used the "Install OpenCore to disk" choosing ssd efi this time. It asked for reboot, I did it, then I removed the usb drive and I reboot again to confirm... and yes it booted without usb. I open OCPL again I check the post install root and I saw I had to apply a patch. I did it and rebooted. Now everything seems to working great!
Thanks again!!!!