If you want to practice what you're learning you don't need PCS7. You can install "STEP 7 V5.5" or "STEP 7 V13". Click the links below to find more information on different license types for STEP 7:
I appreciate your co-operation and your patience with me. I want to download s7 v5.5 or s7 v13 into my own personal laptop only for the purpose of simulation in order to improve my knowledge. Thank you.