As with many indie projects, the transition to complex fluid physics in 0.8 led to immediate bugs. The was released shortly after to address these friction points: Comments 522 to 483 of 851 - Archipelagates by RalivDev
Saves are typically located at %USERPROFILE%\AppData\LocalLow\RalivDev\Archipelagates\saves . Archipelagates-0.8-hotfix-windows-64.zip
Use a tool like 7-Zip or Windows Explorer to extract the .zip content. As with many indie projects, the transition to