Hi Richard,
I would recommend to uninstall old version and then install new, when we are in beta stage.
Make sure you place your own scripts in UserScripts or out of thinBasic installation directory, to not get them accidentaly deleted.
Once the thinAir design stabilizes, it should be possible to just "update" existing installation too, to preserve thinAir settings for example. Currently, in beta, some thinAir storage settings might change.
Petr
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