What is the maximum size a widget can be? Not memory usage but binary size?
For example I want to include a load of bitmaps, which will make the widget size large but only load 1 at runtime.
The widget itself does not have a limit on file size. The devices do have a maximum storage size they will allow for installing apps. Once the limit is reached you are unable to install additional apps. I believe the limit is currently 512KB on the VivoActive. It may vary from device to device. The limit should be show when installing apps with Garmin Express or Garmin Connect Mobile.
Yes, the active memory limit is 64KB, but I'm pretty sure Rupert was asking about the max .prg size. There is a limit of 16 slots, but there is also a limit of max size. If you reach the storage limit before you reach the 16 app max, then you won't be able to install more apps. I suspect side loading circumvents the size limit, but I don't think it can get around the slot limit.