I do not know if different regional versions are available but you can find older trial versions of most of the recent older version of Adobe software at the site linked below (CS5 section linked,,, try other sections as well)
If you happen to find what you are after, be sure to follow the Very Important Instructions section to acquire the files.
LS1 – English (US / International)
LS2 – Japanese only
LS3 – Chinese Simplified & Traditional / Korean
LS4 – Western / (Northern) Europe languages such as Danish, French, Italian, Portugese, Dutch, Finnish, German, Norwegian, Swedish* etc (Look at LS5 for Swedish notes)
LS5 – Not seen in CS5 products, but seen in Fireworks CS4 which is Swedish. I am suspecting LS5 for other CS4 products are also in Swedish as well.
LS6 – Eastern European (Czech, Romanian, Russian, Turkish, Ukrainian, Polish, Hungarian) * I did not found such files for Fireworks CS4, can anyone verify that Fireworks CS4 is not available in these languages?
LS7 – International version (Only in After Effects / Premiere Pro which contain all languages available for these two products)