This wikiHow teaches you how to view a Crystal Reports.rpt file on a Mac or PC using the free SAP Crystal Reports Viewer application.
Steps

Step 1. Go to http://www.crystalreports.com/crystal-viewer/ in a web browser
This is the download site for SAP Crystal Reports Viewer, a free application for Windows and macOS that can open.rpt files.
- If you are using a Mac, you will need to install Legacy Java Runtime 6 before you can install the Crystal Reports viewer. You can get it for free from https://support.apple.com/kb/dl1572?locale=en_US.

Step 2. Download the installation file
- To start the download, fill out the form (name, country, version and mailing list preferences) and then click Free download (Free Download).
- Do click in the link Installation package (Installation Package) for your operating system.
- Save the file to your computer.

Step 3. Install SAP Crystal Reports Viewer
The downloaded file is a compressed (zip) file, so unzip it into a folder and then open the folder Data_Units, where you will find the installer for Windows and macOS.
-
Windows:
double click on CRRViewer.exe and then follow the onscreen instructions to complete the installation.
-
macOS:
double click on Crystal Reports 2016 Viewer.dmg, drag the icon to the folder Applications and then follow the onscreen instructions to complete the installation.

Step 4. Open SAP Crystal Reports 2016 Viewer
It is in the section All applications from the "Start" menu in Windows, and in the folder Applications on macOS.

Step 5. Click Agree
You will only have to do this the first time you run the application.

Step 6. Click Search Report
It's under the heading "Open." This will open your computer's file explorer.

Step 7. Open the folder that contains the.rpt file

Step 8. Click on the.rpt file to select it

Step 9. Click Open
This will open the.rpt file in the viewer.