The Ethereum solidity Remix IDE doesn't work for some reason.
It doesn't seem to load the various compiler versions and renders the error:
mock compiler: source not found
I've tried to install remix-ide , the special npm package but I still can't find the old solidity compilers in the Setting drop down list.
This is a known issue being tracked at https://github.com/ethereum/remix-ide/issues/990.
Remix is trying to reach out to another server (https://solc-bin.ethereum.org/bin/list.json) to display possible versions of solidity, but that server is not responding.
For now you could use this older version of Remix: https://ethereum.github.io/browser-solidity.
