How can i get the old software?

In case this is about your Mac and it meets the hardware requirements, follow the steps mentioned in this article, after you opened it in Safari:

How to get old versions of macOS - Apple Support

Downgrading iOS is not supported.

If iOS is not working correctly on your device, setting it back to factory settings would be the first step.

Restore your iPhone, iPad or iPod touch to factory settings

jezabel ~ Please read this article and then post back here:

Writing an effective Apple Support Communities question

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