After updating the app a pop up window is saying that catalog 3.18 is found when 3.17 is spected.
According to:
https://github.com/Stellarium/stellarium-data/releases
3.18 is to be used with 1.2 version.
I have solved the issue by downloading 3.17 and putting it into:
~\Portableapps\StellariumPortable\App\Stellarium\nebulae\default
