I am using Windows 10 Home
and I am currently on version 3.04 of audacity, but I am trying to install version 3.05. When i try to install it the systems tells me that i cannot because Audacity is already running in another folder and must be closed first but I am not actively running audacity.
try rebooting your computer before attempting the install.
(also, 3.0.5 only fixes a bug on macOS, so if you’re on Windows, you can safely skip that version anyway)