ProductKeyCheck::applyKey() contains invalid arguments

After switching to use latest 1.5 branch the ProductKeyCheck::applyKey's
arguments().at(1) return invalid value.

Before (around 4 weeks old 1.5) this argument has had value e.g.

"/home/<username>/<your_installation_dir>/5.2.0-rc1/gcc_64"

Now the latest ifw 1.5 produces this value in the same situation:

"/home/<username>/<your_installation_dir>/Licenses"

This seems to happen no matter what Qt package you install, desktop or Android ones.

The installscript.qs part has not changed, the operation is triggered from there the same way as always. Same argument count and number or arguments.