That should be Miss Hutchinson to you. You're to report to her study at break time!

Suggest changing to DNG saves in camera as from now and using the Adobe converter or DCU5 to archive existing photos into a usable format. I use Elements 11 for my out of camera K-1 DNGs without issue.

If you install the compatible version of ACW for your Elements 13 and use the dng format you won't need Elements 2020 (unless you prefer it of course.)

It appears the earliest version of Elements that would be compatible with the K-1ii is Elements 2019 which comes with version 10.4 of ACW and I believe you could update its ACR plugin to version 11.4 which is later than the version Elements 2020 ships with.

Really can't see how using pef gives any advantage unless you enjoy the hassle of incompatibility though if you must you've found your answer. Just note that Adobe like to sell you a new version of their software every year it seems.

Yes, you're right. I was getting it confused with https://helpx.adobe.com/uk/photoshop/using/adobe-dng-converter.html which is stand-alone.
Makes more sense to use DNG in the first place so conversions won't be required. I can't think of any benefit so use PEF unless one only uses DCU5. We're fortunate Pentax supports DNG natively, not all makes do.

As for developing a fault it should have the full normal, as new, guarantee, albeit any cosmetic damage wouldn't be covered. The buyer's contract is with CameraCentreUK.
Buying one of those I'd make sure it is fully covered and get that in writing as they do have a reputation for the AF failing.

Whatever happened to backwards compatibility?

I wouldn't have thought Adobe would cease the support for a camera that was available in an older version, though it seems that could be the reason. What's the sense of that? A good reason for never updating!
In any event the K-1 isn't that ancient, they're still being sold new.

Re DCU5 - it used to require the original disc to install it, though there is a workaround.

I've spotted there are old versions of ACR here: https://www.filehorse.com/download-adobe-camera-raw/old-versions/

Or from here: if you prefer to download from Adobe: https://helpx.adobe.com/uk/photoshop/kb/legacy-version-updates.html#acr_version_download_links

What type of PC do you have and what OS? Also how much ram in it?
Just trying to eliminate a potential lack of resources available to cope with the large files.

You say, you can convert the file / folder to a DNG, presumably by selecting that option in he camera settings so that seems to be your best way forward. Or do you mean by using the Adobe camera raw convertor?

Have you tried using Pentax's software that came with the camera? That's designed to open them!

To open K1 PEFs directly in Elements you will need a very recent version of the software. You can check which versions should be OK on Adobe's website.

Se https://helpx.adobe.com/uk/camera-raw/kb/camera-raw-plug-supported-cameras.html

Have you read
https://www.pentaxuser.com/forum/topic/classified-advertisments-guidlines-11679
:

Merry Christmas to all from me too.

Don't forget if you want to take and produce a seasonal card for everyone on PU you can upload it for this month's Monthly competition. The only proviso is it has to be taken with a Pentax camera this month.
See the entries so far here: https://www.pentaxuser.com/competitions/monthly--90----season-s-greetings-891
Now's the time to do it!

Re Harrow Technical. From the website link I gave they say:
There are other options but they may not be be helpful as Benigne hasn't indicated where he/she is located.

Yes, Asahi Photo is another option for cameras but not lenses any more.

Also Alan Marlow (who is also in the process of retiring!)