Ok.. tested on my home network, same results - can't update

But like I mentioned before, my new package can be installed without any errors/problems as NEW app. Also it can be reinstalled the same version over the already installed. But if I will create another new version and will change only version number (0.8 -> 0.9). I start to get the same error during installation
Something mystical...

P.S. When I run rpm -qi package I can see also this lines:
Relocations : (not relocatable)
and
Signature : (none)

What this mean ? And maybe it should be completed somehow ? But I also saw this on previous versions and all worked without any problem