Step 1: Go to https://www.malwarebytes.com/antimalware/.
Step 2: Click Download free version. You may be redirected to another site; follow the instructions on that page to download Malwarebytes.
Note: If prompted to purchase Malwarebytes, decline and proceed with the free version.
Step 3: Save the installation file to your computer.
Step 4: After the download is complete, double-click the file to begin installing Malwarebytes.
Step 5: Follow the instructions on the installation screen. Note: Make sure Enable free trial of Malwarebytes Anti-Malware PRO is unchecked.
Step 6: After you finish installing Malwarebytes, update its malware definitions before you scan your computer.