Vanity of Vanities, all is Vanity

If you are formatting a paper for lipics, but don’t want all their files in the paper directory, add the following to the top of the main latex file:

\makeatletter
\def\input@path{{lipics/}{../lipics/}} 
\makeatother
\documentclass[a4paper,USenglish,cleveref,autoref,thm-restate]%
{socg-lipics-v2019}

This is under the assumption that lipics/ subdirectory contains the .cls file.