When updating to a new version of LILO , the initial steps are the same as for a first time installation: extract all files, configure the Makefile, run make to build the executables and run make install to install the files.
The old versions of boot.b, chain.b, etc. are automatically renamed to boot.old, chain.old, etc. This is done to ensure that you can boot even if the installation procedure does not finish. boot.old, chain.old, etc. can be deleted after the map file is rebuilt.
Because the locations of boot.b, chain.b, etc. have changed and because the map file format may be different too, you have to update the boot sector and the map file. Run /sbin/lilo to do this.