I'm having problems installing .sis files on my N93. Around 50% of them don't work (they give a "installation not supported"😉 error message, even though the software in question is specifically said to be compatible with the N93. For example, yesterday I tried to install a python script (which is basically just a text file) contained in a .sis file, and I got that error.
In the app manager, I've set installation to "on" (I think it's called "all" in the English version though. I have the Swedish version). Online cert validaiton is turned off. The phone is not locked down by the operator in any way, because I didn't buy it through an operator.
Has anybody been able to solve this problem?