Nothing has changed. Incompatibilities are still there so we will continue shipping TracAccountManager-0.3.2.
In order to upgrade your stack you should backup your directories and configurations before doing any change.
You can find specific instructions in the Bitnami Trac Wiki Page appropriate section.
You can also find here a list of available Trac plugins. You will need to check the plugin you want to install to ensure its compatible with your Trac version.
Do not hesitate to post again if you find any issue of have more questions.