So maybe you can share it somehow?

Here it is: Polish and Czech versions of the game:
http://www.megaupload.com/?d=6KJTT4GK (Polish, with voice acting).
http://www.megaupload.com/?d=EI0KKHFD (Czech).

Of course, you need DosBox to launch the game. The easiest way is creating a shortcut, like this one used in GOG games. I reused conf file from GOG English version.
Target element (element docelowy):
%DOSBOX%\doxbox.exe -conf dosboxTeenagent.conf -noconsole -c "exit"
Begin in (rozpocznij w):
%Teenagent%

Notes:
1. %DOSBOX% - folder with installed dosbox (not included with the game).
2. %Teenagent% - folder with game (after downloading it, use WinRAR to unzip the RAR file).
3. Technically, uploading the game in different languages (Polish and Czech) should be legal, because Teenagent is freeware. However, GOG offers only English version of the game.
4. Need more help? Feel free to ask.

Damn it's temporarily unavailable:( But thanks a lot for that! I've been looking for it some time ago and I couldn't find it.It's ok now. Thanks a lot:)

Big thanks, agencie zero-zero-siedem :)
As MegaUpload sucks, I've reuploaded those precious files to my personal 4shared:
http://www.4shared.com/file/kj5IAUZG/Teenagent_PL.html
http://www.4shared.com/file/jRpY9JN5/Teenagent_CZ.html
and I assure you, I will not delete them at any circumstances ;)

http://www.youtube.com/watch?v=N4EFLtChhEM

This video shows the game in Spanish. Sadly, I haven't found this version yet.

Fellow white-red GOGers, I finally layed my hands on the "Nowy Teenagent" CD from cult Gambler magazine. It does have it all - full redbook audio soundtrack, voice-overs and secret additional "white rap" song :) What it truly terrible, I can't make it run on my PC, as the DOSBox crashes together with XP using good ol BSOD. What is funny, I haven't got ANY trouble installing it on my friend's Vista laptop.
Ideas? Or just post the whole ISO here?

Would be awesome if you posted it here somehow. Nobody of the GOG staff removed the previous links in this thread so apparently they don't mind.

Wow, voice acting really sucks badly :O I have Gambler CD (not working), but i don't remember any voices from the game, I had to check YT.

Really, just play only with subtitles, because for me "VA" make things worse.

Teenagent PL is available on cdp.pl for free :)

I have found Espanol/Spanish version. Some of you might be interested.
Be careful: I didn't check if it is free of viruses, so you download on your own responsibility.

http://juegolibrepc.blogspot.com/2012/06/teen-agent-pc-dosbox-portable_22.html

If you still have it, I'd be interested. I love the soundtrack from the GOG version and I'd love to hear all the music from the CD version... I tried finding a download of it, but most of my searches result in dead links or phishing.

is it with full audio track?

IIRC the game has full polish voice over.

The 4shared links are dead too, can you upload it to mega.nz (the polish version with audio) ? It's free and you have 50 Go of storage.