Secure folder on galaxy s5 (android 6.)

[Android Central Question]

I got galaxy s5, and I used to use knox. But, unfortunately Samsung replaced knox with secure folder which is not and can not be installed on my galaxy s5 because it's not suitable.
I tried apk but I got negative results
Any idea how can I install it? I really need it

 

[Saleh Shehade]

Any help?