Vim-plug plugin manager unable to use post-update hooks on YouCompleteMe plugin

I am using vim-plug plugin manager and it worked great until I tried to install Youcompleteme plugin with it. I tried putting Plug 'Valloric/YouCompleteMe', { 'do': './install.py' } on my .vimrc and tried PlugInstall! and PlugUpdate! without success. I read the documentation from github and I thought it should work like that.

Althought I am unsure if this should be done by running ~/.vim/plugged/YouCompleteMe/install.py --all in command line , as I am not using vundle.

Ps. My computer is using Arch Linux, but I don't think that it relates to this problem.

If you need more info please let me know!