I'm not sure you can. You should put in a call to Adobe Customer Service in Poland.
Would you mind listing the steps here as well?
You never know when an external link is going to break, and it would be really helpful to other users with this problem in the future if the information was here with the question.
- Install the Polish version normally. Do not run it.
- Replace the files epic_pers.dll, Required\idsn.sif and Required\Basic Tools.rpln with ones from the English volume version from Adobe’s website
- Run InDesign as admin and enter the key from Adobe’s website
- Install any needed updates
Actually, you don't need to do any of that. All you need to do is this:
1) Click on this link to download the software:
You may need to login using your Adobe ID.
2) The link will take you to the download page and it also gives you the serial numbers to use. For example I grabbed this info:
They have links for all CS2 products with the appropriate serial numbers:
See this partial screenshot:
I think you missed the main point here. Those downloads are all English language and the OP's client needs the Polish version (which, it seems, was provided by Winsoft as a contractor for Adobe).
Could it be that the download link supplied in post #5 is for multilingual product like other adobe products. I haven't tried it because the link is for a very old product.
My first encounter with Adobe was with CS4 and it came with multilingual installer and the user needs to select the language at the time of installation.
Apparently it is not. The OP investigated that quite thoroughly.