You can opt out of the installation of Simplicheck when you chose 'Custom Install'.
But I agree, it's just wrong to bundle unsolicited cr*pware/ransomware with Xara software. It's always been free from baggage like this and it's bad form to start doing so now.
I don't mind seeing offers in my email from Xara or MAGIX, but I reject being force fed other software when I haven't asked for it.
Being more up-front with a clear option box without having to chose the custom install is the right thing to do.