Fixed

• Inside LiveContainer, “Use SideStore's certificate” now works (#95). SideStore's reply can't reach SideInstaller there, so SideInstaller takes the certificate LiveContainer holds instead (its built-in SideStore's, or the copy LiveContainer imported) and checks it against your Apple ID as before.
• Inside LiveContainer, “Get it from SideStore” now imports the pairing file LiveContainer's built-in SideStore keeps, asking first, instead of opening SideStore for a reply that never came. In Multitask Mode, or when there's no file to take, it says what to do instead.