I installed the .deb package 64bit, but for some reason it couldn't set pythonpaths correctly. I could solve the problem by adding to paths to pythonpath as you said, as follows:
And that solved import problems, but a python problem (listed as bug since python 2.6) showed up:
undefined symbol: Py_InitModule4
And this was easily solved by editing line 113 in the /usr/include/python2.7/modsupport.h to
#define Py_InitModule4 Py_InitModule4_64
In Mint, I also installed .deb package, but I did not tested above solution yet, but it will probably work.
Thanks for your help.