Yes you can install the new Monocok 2 even if you have installed a previous version 1.xx.

1 - Uninstall the previous version of Monocok.
2 - Please install the new version 2.
3 - Then you can evaluate Monocok 2 for 30 days.
4 - Good building with Monocok and don't forget to send some images of your model...