thanks, mate - just succeeded with Croatian...

so, guys, here's the link to the Swype 3.26 for Android: http://depositfiles.com/files/ei2a59x2a

the file You downloaded has the extension .apk, change it to .zip and extract it somewhere on Your pc...

all files You need are only in the "files" subfolder. all files containing your language name ought to be copied into /home/user/.swype/data folder on Your Nokia N9 (create it if it doesn't exist)... plus You need to edit language.lst and helplanguages.lst files - open them in text editor and edit them in a way that only names of the languages You had before in Your N9's Swype menu + Your own, now added, are written. save it. these two, now edited files, also need to be copied to /home/user/.swype/data... and that's it!

Some languages need alphabet layouts too (the files ending with zkb.le), so, if your language doesn't load, find the Symbian pack in Nokia Beta Labs and see what layouts it needs.

[Languages: EnglishUK, EnglishUS, Bulgarian, Croatian, Czech, Danish, Dutch, Estonian, Finnish, French, FrenchCH, German, Greek, Hungarian, Italian, Korean, Norwegian, Polish, PortuguesePT, Romanian, Russian, SerbianLA, Slovak, Slovenian, Spanish, Swedish, Turkish, Ukrainian]

[in case Your language is missing google it, but just Swype 3.26 for Android, because other versions can't be installed for some reason.]

all credits to @SynergyX, who found this method in the first place.