iATKOS | United Kingdom

So I have the MacBook Air Early 2014 11 Inch.

It's on Big Sur rn and I need to upgrade cause literally nothing works here so I downloaded OCLP and tried to download the installer for Ventura cause I had later versions on the Mac before and they were laggy. But as soon as the download gets halfway it shows this error code and then just stops and it does this with the later versions too. I have now tried downloading Sonoma,Monterey and sequoia even and they all end up with this error code . So is it OCLP that is not allowing me to download the installer or am I doing something wrong ? I even tried downloading an older beta version of Sonoma but it didn't boot on the Mac and that was a nightmare trying to get the Mac back to Big Sur, sorry for the long rant but I would really appreciate the help !!
Thanks in Advance !