Papers 2 is no longer officially supported by the Papers Team since Papers 3 was released back in 2013. This means that although you can still continue to use this, any bugs/issues encountered will no longer be fixed as we no longer have resources to do so. Although you can try to download the last Papers 2 version 2.8.3 here in any case you haven't yet.
We do encourage you to upgrade to Papers 3 but please make use of the 30 days to try out Papers 3 before deciding to upgrade.
You may also find the KB links below helpful as well:
Please do not hesitate to get in touch if you have any other questions.