here is the way i did it:
1. did one capital punishment install with the tosec images from planetemu and the latest whdload-installer. during a pause in floppy disk acces, e.g. when you are promted to insert disk2, i overcopied lha 1.21 (freeware without key) to T:Lha so that cfou's installer depacked the data with my actually working lha (the one from amigasys4). this install freezes when it is supposed to ask for the cp-upgrade. but before data is depacked and installed right. so you have (1.) CP-WHDLoad-Install WITHOUT UPGRADE.
2. did another install in another folder, keeping T:Lha from cp-disk1 - the way it was originally supposed to work in cfou's installer. confirmed the cp-upgrade and waited for the installer to finish. the problem is that in this install most of the cp-folders simply miss. e.g. "music". there you have a totally incomplete install, but (2.) CP-WHDLoad-Install WITH UPGRADE.
3. i copied cp(2.)-folder over the cp(1.)-folder and the game now works flawlessly to the end.
maybe it is just me, for some reason, who has that sort of strange depacking issues, but still i wanted to let you know...