Let's say you wanna install Lasso on another WordPress site. Easy!
Log into your account at: app.getlasso.co (keep this tab open)
Download the latest version of the plugin (.zip folder) and copy your license key.
Install and Activate the plugin on the new WordPress site.
Next, head to Lasso > Settings inside WordPress and enter your license key.
Then, go to your Account page and under Active Installs, activate your new site. You'll be prompted about the pricing change.
Once you've activated the new site, your license key will work as normal.