PacksPanel NPE if before TargetPanel
NPE at PacksPanelBase line 245 (installData.getInstallPath() is null)
Didn't see anything in the migration guide or other docs, and had to dig into the source to find the cause. A better error message would be helpful, at the least.
Worked fine in 4.3.0.
Workaround: Move PacksPanel after TargetPanel
Welcome to the group of issues
Probably a variation of IZPACK-918.
Needs a solver.