I downloaded and installed 2.0.4. It will not open any of my sketches unless I rename them, a total PITA. The sketches worked fine, in fact were created and named with 2.0.3 which worked fine for me.
How do I reinstall 2.0.3? I cannot find it to download it.
maybe in GitHub Release 2.0.3 · arduino/arduino-ide · GitHub
Can you give some examples of sketch names? Were they created in IDE 2.0 or in older versions of the IDE? There is somewhere a specification for the filenames. A bug in the older IDE 2.x allowed you to create sketches with filenames that did not match the spec.
I strongly suggest that you rename them; you have invalid names and it will haunt you forever because you will never have an option to 'enjoy' newer versions of the IDE where bugs have been fixed and improvements have been made.
I use rather long, descriptive names with spaces and periods (for version numbers).
I think that I will finish the project that I have been working on. After it is complete, I will rename the final files, delete the ones I no longer need and then upgrade.
Periods are allowed anywhere in the name except for the first character.
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