Well, the subject says it all. Task Coach portable paf setup even does not take the time to ask the user if he wants to keep his .tsk. So, updating Task Coach paf instead of installing to a new folder to keep the old tasks and settings safe cannot be recommended, unlike other paf's.
Edit 29 Jan: Good chance that I didn't find a bug but that the problem is me being confused with installation locations, .lnk's and backup copies. I am sorry. I need a secretary ...
Where did you save it? Most folks save it to their Documents folder. Or if they want to keep things self-contained, to the Data folder inside TaskCoachPortable. If you save it to the App directory or somewhere inside that, it'll get deleted. Never save anything within there. That's also why there is a note in the app directory saying not to mess with stuff inside it.
Sometimes, the impossible can become possible, if you're awesome!
The save location was in g:\...\TaskCoachPortable\Data\settings\*.tsk. Now in g:\...\technote\...
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