want to install acrobat reader dc in all my office desktop (total 40 nos) do i need any license to buy?

Hello Jayaprakashj,

Both Acrobat Reader DC and the Acrobat Reader mobile app are free and available for volume distribution. As correctly mentioned by Gilad and Aandi that individuals can download Adobe Reader and it's free and it does not require any license.

However, a Distribution License Agreement is required for:

• Corporations and organizations that want to distribute Acrobat Reader or the Acrobat Reader mobile app on a company intranet site or local network.
• Commercial vendors that want to bundle Acrobat Reader or the Acrobat Reader mobile app on physical media such as a CD or DVD, on OEM hardware such as computers and mobile devices, or with OEM hardware such as scanners.

So, in your scenario, you need to fill the Distribution license form to get the freeware Adobe Reader. For detailed information, please refer to the following help article and apply for the distribution license Volume distribution | Adobe Acrobat Reader DC

Feel free to update this discussion for any further assistance.

Thanks,

Anand Sri.