Complex sentence: Many users consider the latest version too overloaded by unnessesary addons (Gadu-Gadu Radio Station etc.), so the older versions (especially 6.1 build 158) are still more popular than the new one.
Split into simpler sentences: Many users consider the latest version too overloaded by unnessesary addons (Gadu-Gadu Radio Station etc.). So the older versions (especially 6.1 build 158) are still more popular than the new one.