Getting me a new (used) K-7 got me also excited. That excitement unfortunately vanished with the search for the Pentax specific software for browsing and altering PEF format. The software were found on Ricoh’s website, but unfortunately it didn’t install. Why? Pentax closed out all users who do not own the original CD with the original camera software. **great:sarcastic**

Luckily some other people also faced the same issue and were able to resolve it. Just stub something that mimics the CD’s naming, and you’re able to install the software (called “… Update”) no issues:

So you have purchased a new-to-you Pentax DSLR and would like to have the Pentax software installed. Problem is that you don’t have the CD that came with the camera. You can go to the Pentax site and download the software but it’s called an update and won’t install without the original software or CD… Well, seems that you don’t need the original CD or the software installed on your computer to be able to install the software.

1) Download the software here, you can download the version 4 or 5 (your preference), the 64bit version 5 would be the better software if your computer can handle it: Software Downloads : Support & Service | RICOH IMAGING
2) Get a SD card or USB drive and insert into the computer.
3) Rename the card or drive S-SW90 for use with version 4
4) Rename the card or drive S-SW140 for use with version 5

Nothing has to be on the card or drive, they just have to be renamed.
Run the updater software that you downloaded above and just choose the defaults as it installs.

dkennely’s article:
https://www.pentaxforums.com/forums/32-digital-processing-software-printing/376511-pentax-digital-camera-utility-installation.html#ixzz7e0nW0GgF