So after months of not knowing what happend and why my site got broken many times, disabling the plugin had effect.
I dont know what happens and yes it could be my setup but i have tried to solve it again and again.
At least three times the editing of the files goes wrong and the site dies, be it completely or just the order/whmcs part
I now had i looked at by an external party as i trust wpmudev, they decided to remove the plugin due to the way it deals with the http class.
So.. i can use that plugin now, the good part is that my website stays in a usable state.
I would love to solve it however, but cant have my website down all the time, i even changed server and service provider to help this, but no effect. I can give a backup for u guys to see, but i understand that hats not going to help. Until the way the patching is done has changed its a too big risk, no matter what the reason is, patching can go wrong and there is no check