hmm.... no, I've definitely got all the files and dirs in the Prof-Gnome dir
PS C:\Users\USERNAME\Geany 1.38\share\themes\Prof-Gnome\gtk-3.0> dir -R
Directory: C:\Users\USERNAME\Geany 1.38\share\themes\Prof-Gnome\gtk-3.0
Mode LastWriteTime Length Name
---- ------------- ------ ----
d----- 2021-12-28 13:50 global-graphics
d----- 2021-12-28 13:50 theme-colors
-a---- 2021-12-28 13:50 25383 COPYING
-a---- 2021-12-28 13:50 240 gtk-dark.css
-a---- 2021-12-29 11:56 242 gtk.css
-a---- 2021-12-28 13:50 215739 main-dark.css
-a---- 2021-12-28 13:50 214270 main-light.css
Directory: C:\Users\USERNAME\Geany 1.38\share\themes\Prof-Gnome\gtk-3.0\global-graphics
Mode LastWriteTime Length Name
---- ------------- ------ ----
-a---- 2021-12-28 13:50 28522 after-horizontal.svg
-a---- 2021-12-28 13:50 5820 bullet-disabled.svg
-a---- 2021-12-28 13:50 5073 bullet-symbolic.svg
-a---- 2021-12-28 13:50 5832 bullet.svg
-a---- 2021-12-28 13:50 1676 list-remove-symbolic.svg
-a---- 2021-12-28 13:50 4320 Null.svg
-a---- 2021-12-28 13:50 1899 object-select-symbolic.svg
-a---- 2021-12-28 13:50 1913 object-select-symbolic@2.svg
-a---- 2021-12-28 13:50 2190 scale-slider-active.svg
-a---- 2021-12-28 13:50 2206 scale-slider-active@2.svg
-a---- 2021-12-28 13:50 2192 scale-slider-disabled.svg
-a---- 2021-12-28 13:50 2193 scale-slider-disabled@2.svg
-a---- 2021-12-28 13:50 2189 scale-slider-hover.svg
-a---- 2021-12-28 13:50 2188 scale-slider-hover@2.svg
-a---- 2021-12-28 13:50 2183 scale-slider.svg
-a---- 2021-12-28 13:50 2184 scale-slider@2.svg
Directory: C:\Users\USERNAME\Geany 1.38\share\themes\Prof-Gnome\gtk-3.0\theme-colors
Mode LastWriteTime Length Name
---- ------------- ------ ----
-a---- 2021-12-28 13:50 5320 colors-dark.css
-a---- 2021-12-28 13:50 5376 colors-light.css
For reference, here is 1.36 on GTK 2 767×582 png58 kB
More than just "me preferring it", this looks very native to windows. It looks like it belongs
This is 1.38, gtk3, out of the box 
Its a little cartooney, which I dont like. But it also doesn't fit in very well to the rest of windows, and, the sidebar is wicked spaced out. To its credit tho, it still maintains usable checkboxes and radio buttons and other UI elements. My checkboxes are White-on-blue, grey-on-blue, and white
This is 1.38, gtk3, with Prof-Gnome 
The sidebar is much, much, better (although not perfect). But! Other UI elements are worse. I no longer have a "greyed out" checkbox, and if you look closely, the circular radio buttons (like position left/right/bottom/right) are red squares plastered over a circular background
