How to disable updates in WordPress theme

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First of all, it is a very bad idea to modify the original theme without creating a child theme. Disabling updates of such theme is even worse idea, because without updates, your site may get infected or attacked.

So the long-term solution would be to:

  1. Check the version of modified theme.
  2. Download that version from official repository.
  3. Compare the original files with modified ones.
  4. Create a child theme containing only necessary modifications.

If you need to disable the updates for a few days, there is an easy way to do it – just change the version of your theme to 9.9.9 – WordPress will think that it is newer than the one in repository and it won’t get updated. (BUT… Don’t think of this hack as a solution – it’s just a dirty temporary fix and you still should perform the process from points above).