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As regards the updates, they are all "differential" updates. This means you only have to change files and it's not necessary to uninstall the previous versions.
As regards the unistall, there are three ways:
- remove the imagegallery folder in extensions (this leaves entries in appreg.db, but you can live with it)
- remove the imagegallery folder in extensions and replace a appreg.db backup (if you made it. this is difficoult as it affects other wafs if you installed them after having done the backup)
- find uninstall commands similar to those used to install the waf.
By now, the first solution is the easier.
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