All good! I fixed it.
It was on my end, but my google play account wasn't synchronised with any countries. So I reboot the GPS Store and synced my account one more time, and Done!
Thanks for the help and my bad ^^'
Away until (at least end June but maybe) mid July, so hack me and leave a message
EDIT : I am actually leaving this Beta, good luck for the devs and have fun hacking!