APK request for vers 1.6.4.2 with CryptoBundle. Wasn’t able to build from source myself, sorry I am not a programmer.
1.6.4.2 did not contain the crypro bundle. It is included in all 2.x version when downloading on F-Droid. Why do you need such an ancient version?
Last version that works with Gingerbread for an old tablet I have. Slinger’s fork seems to have the code back that far but not the associated APK.
The fork has the old code (just like the main repository) but the crypto bundle was not backported to older versions, as far as I know.