How to transfer photos from KEYone to my desktop computer?

How to transfer photos from KeyOne sim card and microSD card to my desktop computer?

Your SIM card doesn't hold any photos, only your SD card does.

1). When you plug your KEYone into your computer and the green window pops up on it, tap Charge & Data, then choose Transfer Files or Transfer Photos.

Or..

2). Enable Google Photo synching and all the files will be synched with your Google Photos account then you can download them through your desktop browser.

Or..

3). Take your SD card out of your device, put it in your computer if you have an SD card slot / adapter and copy and paste the files to your computer.

There's plenty of other ways as well if none of those work for you.

I use Blue Tooth for this all the time.