Reinstalled up-to-date Firefox Dev Edition, TMP not working with version 119.0b9 - corrupted again

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After fighting through this when I got a new PC a couple of months ago, this post had helped me get TMP working. I reinstalled this morning and Dev edition is reporting version 119.0b9, but for the life of me I cannot get this working. It keeps telling me the xpi is corrupt.

A few things I can confirm:

• Completed a full uninstall including deletion of application and profiles folders, reinstalled (latest Win 11).
• Used the instructions and files from the links above (b/c in the past different versions of config.js and utils files had been mentioned in various threads and some were necessary to fix my issue).
• the chrome folder in the current user profile is lowercase
• within that folder I've copied the jsm and manifest files, also tried creating a utils folder under that and copying them there b/c I was unsure if the full path had to be extracted. I think the extra subfolder is unnecessary and ignored.

I've tried this from scratch 5 times now with no joy. Are we sure something hasn't changed again in the chrome.js or elsewhere that needs to be changed to get TMP working again?

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Solved.

1 - it had created a new profile folder somehow and even though I'd previous launched from the about:support link to the profile folder I was looking at the wrong one now
2 - apparently you DO need to create the utils subfolder under chrome and put the files in there, not in the chrome folder itself