Please take a look at the Anaconda repo archive page https://repo.continuum.io/archive/
and select an appropriate version that you like to install.
$ wget -c https://repo.continuum.io/archive/Anaconda3-vers.num-Linux-x86_64.sh
$ bash Anaconda3-version.num-Linux-x86_64.sh
$ wget -c https://repo.continuum.io/archive/Anaconda3-5.0.1-Linux-x86_64.sh
$ bash Anaconda3-5.0.1-Linux-x86_64.sh
OR try this
# Go to home directory
cd ~
# You can change what anaconda version you want at
# https://repo.continuum.io/archive/
wget https://repo.continuum.io/archive/Anaconda3-4.2.0-Linux-x86_64.sh
bash Anaconda3-4.2.0-Linux-x86_64.sh -b -p ~/anaconda
rm Anaconda3-4.2.0-Linux-x86_64.sh
echo 'export PATH="~/anaconda/bin:$PATH"' >> ~/.bashrc
# Refresh basically
source .bashrc
conda update conda
