If you want to use Lightroom on two computers, you will need to purchase two separate licenses for the software, either as a standalone product or as part of a Creative Cloud subscription. You can then install Lightroom on both computers using the same installation process, using the serial number or activation code provided with each license.
Keep in mind that Adobe’s licensing terms generally allow you to install and use Lightroom on two computers that you own and use, as long as you are the only person using the software. However, it is not permitted to share a single license between multiple computers or to use the software on more than two computers at a time.
If you have any questions about the licensing terms for Lightroom, it is a good idea to consult Adobe’s documentation or contact Adobe’s customer support team for more information.