Three steps and your stores are licensed.
Open your Whop account, go to Cachhop POS and copy the license key shown there.
Download the Windows installer, open it and click through setup. Everything is included - nothing else to install.
Sign in as the administrator, open License & updates, paste the key and click Activate. It renews automatically with your subscription.
Just paste the key into your existing Cachhop - all your data stays.