The zip contains two APKs, install them both (one is the calibration tool, the other is the input method itself). After install you'll need to enable in 'Settings -> Language & keyboard'. I've resigned the zips, so you'll need to uninstall any other versions of jonasl's IME if you have them.
v27 (for Android 2.1) - DOWNLOAD (Mediafire Pro) - MD5: 40ba94be920e56fea1fec1801a252eb5
v27 (for Android 2.2) - DOWNLOAD (Mediafire Pro) - MD5: 40ba94be920e56fea1fec1801a252eb5