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Install 32-bit version of libcurl3 from your package manager (Sometimes it's bundled in 1 packages such as libcurl-compat in ArchLinux) and run the game with LD_PRELOAD=libcurl.so.3 in Launch Options...
If that didn't work create a symlink of libcurl.so.3 file into lib64 folder located in game's directory as libcurl.so.4.
ln -s /usr/lib/libcurl.so.3 <path-to-game>/lib64/libcurl.so.4