1- When you purchased Render(in), you must have received a 13-digit code by email in the style xxxxxxx-xxxxxx.
2- Copy the code you received and launch Sketchup.
3- Open the menu Extensions-Render[in]2-Licence…
4- In the window: copy the code
5- Press activate
6- If the following message appears, it’s good. If not, you probably made a mistake in copying your code.