The issue with Bootstrap Studio disappearing from your computer after the update is due to a bug in the auto update mechanism on Windows. The auto update system is a third party open source component that has always worked until this moment, we didn’t expect to see issues with it. We fixed the bug after the first reports, so when you update to our upcoming release it will work correctly.
It’s worth noting that no work is lost, your bsdesign files still exist and are still on the same places on your hard drive where you saved them. The issue concerns only the Bootstrap Studio program files, so if you download and install Bootstrap Studio everything will be back to normal.