Yeah I do have python installed in (fonts hack works good). I suspect I'm not holding the right version of fonts hack module. My PW3 is not doing update collection cleanly at the same time my PW4 refuse to install the package. May be I'm trying with the older version.
Package 'Update_librariansync_1.10_kindle5.bin' (librariansync 1.10 kindle5) is not targeting your device [0PP vs. 11 0F xxxxx], skipping . . .