@Victor
I usually install following the next steps:
1. Locate the version you need to install by opening the following link on your browser
https://repo.continuum.io/miniconda/
for example lets say you decided to use https://repo.continuum.io/miniconda/Miniconda3-latest-Linux-x86_64.sh
2. Download the installer
yum install wget bzip2
wget https://repo.continuum.io/miniconda/Miniconda3-latest-Linux-x86_64.sh
chmod +x Miniconda3-latest-Linux-x86_64.sh
3. Run the installer and follow the steps
./Miniconda3-latest-Linux-x86_64.sh
Note: I usually select a install location like /opt/miniconda3 or similar that can be shared and used by different users
HTH
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