CR2 typically refers to a specific package naming convention (e.g., ProPlus2021Retail.cr2 ), a corrupted download cache, or a second CD-ROM volume (Disc 2). I have addressed the most common technical scenarios below. Post Title: Troubleshooting Office Installation Error "CR2" – Missing Disk or Corrupt Cache Posted: [Date] Category: Office 365 / Office 2021 / 2024 Overview Users attempting to install Microsoft Office (particularly volume licensed or suite versions like Professional Plus 2021/2024) may encounter a prompt requesting "Office Install CR2" or an error stating "The installation source for this product is unavailable. Verify that the source exists and that you can access it (CR2)."