I want to install tensorflow with python 3.5 using anaconda but I don't know which anaconda version has python 3.5. When I go to anaconda download page am presented with Anaconda 4.3.1 which has either version 3.6 or 2.7 of python
You can install any current version of Anaconda. You can then make a conda environment with your particular needs from the documentation
conda create -n tensorflowproject python=3.5 tensorflow ipython
This command has a specific version for python and when this tensorflowproject environment gets updated it will upgrade to Python 3.5999999999 but never go to 3.6 . Then you switch to your environment using either
source activate tensorflowproject
for linux/mac or
activate tensorflowproject
on windows
Per this announcement, Anaconda upgraded to Python 3.6 starting with version 4.3, so... you probably want the 4.2.0 package from the installer archive.
According to the official docu it's recommended to downgrade the whole Python environment:
conda install python=3.5