we are recently upgrading unity from 2017.4 to 2019.3. Meanwhile, we also want to upgrade probuilder from 2.4.x to 4.1.2 which is under control of package manager. however after install probuilder 4.1.2 from package manager, no auto upgrade is executed and pb_object seem to be missing. I'm now trying to copy the probuilder 3.0.x from unity 2018.4 manually to unity 2019.3 which will run an auto upgrade process and then upgrade to 4.1.2 again, but don't know whether it works. Is there any way to upgrade ProBuilder from 2.4 directly to 4.1.2 in unity 2019.3?