Install: Fixed wrong return code check, changed grep -P to -E
Install: Fixed wrong return code check, changed grep -P to -E

mtusnio/LetMeCreateIoT,CreatorDev/LetMeCreateIoT,CreatorDev/LetMeCreateIoT,mtusnio/LetMeCreateIoT,mtusnio/LetMeCreateIoT,CreatorDev/LetMeCreateIoT,CreatorDev/LetMeCreateIoT,mtusnio/LetMeCreateIoT