It's not the limitation of the Resilio Connect, it's the limitation of the file system - the Agent attempts to download a file to a drive with file system that imposes limits to file size. The most vivid example - is the limit by FAT32 file system for single file size of 4 Gb.
Double check the file system on the drive and if necessary, reformat it or remove the big files from the syncing folder.
Error code SE_FS_TOO_BIG_FILE