So, it seems version 17 may work for WinXp, and perhaps trim as well, even if they do not mention how to switch to AHCI for XP, only the newer systems gets a how-to:
https://docs.oo-software.com/en/oodefrag17/tr … incompatibility
(I do know how to set AHCI on XP, just thinking the lack of info on the page points to TRIM not possible or something?)
And, I have no idea if the download will work or not, or if it only acts as a time limited freeware if you don't have any code/licence for it (?)
Edit: and to answer myself:
Note: If do not enter a valid license key, you will be able to use O&O Defrag as a test version for a limited time only.
https://docs.oo-software.com/en/oodefrag17/installation
..unless they have 'freewared' this ancient (2013) version by now, that is.