Those .install links have been broken for awhile.

Download the .debs from http://yannbng.free.fr/Maemo/repo/dists/chinook/
and dpkg -i libtifiles* then dpkg -i libticables* then dpkg -i libticalcs* and finally dpkg -i tiemu2* (order matters for dependencies).

Load the the ROM (.89u perhaps) and skin (the default requires screen rotated; http://www.ticalc.org/pub/win/vtiskins/ try the widescreen ones like ultskin89 for landscape)

Also in landscape mode sometimes the file browser shows no skins (and doesn't work manually either), just rotate to portrait and it sees /usr/share/tiemu2/skins again. Strange bug.