cannot find key

Hi @Basab22401077htz4. I'm sorry to hear about the trouble. Adobe Acrobat Reader DC is a free PDF viewer software and doesn't require a serial number or key. First, uninstall any old copies of Acrobat Reader. Then download an authorized copy here: https://get.adobe.com/reader. Be sure to uncheck the McAfee offers if you don't want them installed.

If you are talking about Adobe Acrobat Pro DC or an earlier version of Acrobat, those require a paid license or subscription. We can't help you with keys here, as this is Adobe's user-to-user forum, and we don't have access to your account information. Log into your Adobe account to manage your plan and see if you have an active license or subscription. Adobe Account.