Hey there,
I tried to rename the sc-Glyphs to lower case names, but neither the mekkablue script nor the geeky way (find (.*).001 replace \L\1.sc) does change the names of the alphabet letters to lowercase. However, the switch from 001 to sc does work.
I updated to the latest version, but still doesn’t work.
This is called a regular expression and therefore the Regex option must be switched on. It works as expected in Glyphs 2.6.6 (1346) on Mojave:
The script also works for me. If it does not convert something, it will tell you why in the Window > Macro Panel, e.g.:
Converting 6 selected glyphs to lowercase:
C: cannot convert to c, glyph already exists. D: cannot convert to d, glyph already exists. E: cannot convert to e, glyph already exists. M: cannot convert to m, glyph already exists. N: cannot convert to n, glyph already exists. O: cannot convert to o, glyph already exists.