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First, you must download a Wikipedia dump file which can be found on dumps.wikimedia.org. The latest dumps can be found here:
The total size of all the files should be around 6 GB or something (so be patient) and would be in .xml.bz2 format.
Second, you will need a program to run your downloaded .xml.bz2 Wikipedia dumps. For that, you can use WikiTaxi. It is free to download and easy to use. Another program that can work here is Kiwix. Try the one that suits you.
Using WikiTaxi or Kiwix you can read the .xml.bz2 Wikipedia dumps. These dumps do not contain images (to reduce file size) and contains only text and are regularly updated. So if you can afford to download around 6 GB of data, then you can have an offline version of Wikipedia with yourself!
Using WikiTaxi or Kiwix you can read the .xml.bz2 Wikipedia dumps. These dumps do not contain images (to reduce file size) and contains only text and are regularly updated. So if you can afford to download around 6 GB of data, then you can have an offline version of Wikipedia with yourself!