With Laragon, adding another PHP version is very easy.Download PHP:
Suppose we want to upgrade to php-7.1.11 Thread Safe 64-bit.
In this case we download:
Very easy huh. That's all forks!
Please be noticed about PHP Version (so you can add new extensions properly)x64 means 64-bit x86 means 32-bit nts means Non Thread Safe
If something's wrong, please check and install correspond VC Redist (VC11, VC14,...)