Hello,
I have been notified about a new PayPlans 4.0.2 and tried to upgrade within Joomla backend from PayPlans directly but it is always failing with error. Attached the screenshot.
I have then downloaded from Stackideas page the full package and was able to successfully install it.
Something is not good with the installation process from Joomla API.
We are using lastest version 3.9.2