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I have a magento site 1.7. I installed the 1.9 version and i connected new installation with the database from 1.7.

Now what should I do to move all extensions and check if they work?

I wanted to do this one by one (not all together) to check their compatibility with new version.

I did a test with a extension and it worked. But that extension had only files on app/code/community (not in another folder)

How do I know for some extension the folders and files of this extension and to move that files in new installation?

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The best practice would certainly be to do it one by one. How you identify which files need to be brought across would be determined by how you got the files.

Third Party / Commercial Non Downloader Modules

Return to the website(s) of the original download you may use this as an opportunity to upgrade as well to the latest versions of the modules. They should come with the full collection of files required and simply put them as they should be according to the developers instructions for installation.

Magento Connect Downloads

These would normally be archived in the cache of the downloader and would be best to be downloaded again directly from there. If that isnt possible then your best hope would be to extract the archive and put them into the correct places manually.

This of course assumes that no modules have had any customisations done to them. If they have, you need to determine why they were - ie was it a bug fix, and if so is it fixed in newer versions of the module or was it fixed in the upgrade of the core. If its a customisation for bespoke business requirements then you would need to either re do those changes to modules, or better yet extend upon the module so that in future updates the changes are in tact.

Otherwise replication of the modified files from the install instructions.

Finally, if the original download is not availible in any source but you need to keep the module for any reason, you would need to review where files are manually. Some common places you should think of looking are:

  • /js /skin/adminhtml (if theres backend functions)
  • /skin/frontend/
  • /app/code/community/
  • /app/code/local
  • /app/etc/modules
  • /app/design/frontend
  • /app/design/adminhtml (if backend functions)

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