# Unfortunately the latest version that worked was 2.49.. When they made the big switch to 2.50 they used exclusively python3....

Commenting post [308](/?blog/2013-308): Unfortunately the latest
version that worked was 2.49.. When they made the big switch to 2.50
they used exclusively python3. Which I understand, because 2.50 was a
big change, and they didn't want to do all the work again later. I
already had a look at porting freecad to py3, but it's a huge work,
many things have to change internally (all strings are unicode, etc...)