@dave r said:

Looks like you installed Curviloft incorrectly. I expect you probably copied the contents of the folder called CURVILOFT_Dir_12 out into the Plugins folder rather than leaving them in the folder as they are supposed to be.

Thanks!
looks like that corrected it! Maybe I've been installing the others improperly as well... though they work LOL
here is the contents of the plugins folder:
__loader.rb
bezierspline.rb
bootstrap_Curviloft.rb
BZ_Dir_14
Curviloft_donation.html
Curviloft_ES.lang
Curviloft_FR.lang
Curviloft.plugin
CurviloftAlgo.rb
CurviloftAlong.rb
CurviloftCurveMover.rb
CurviloftEdition.rb
CurviloftGeometry.rb
CurviloftMorph.rb
CurviloftPalette.rb
CurviloftSkinning.rb
CurviloftSpline.rb
CurviloftTool.rb
DEFPARAM_Dir
Examples
examples.rb
FredoTools__ConstructFaceNormal.rb
FredoTools__CountFacesBySides.rb
FredoTools__CurviShear.rb
FredoTools__MarkVertices.rb
FredoTools__RemoveLonelyVertices.rb
FredoTools__ReportLabelArea.rb
FredoTools__RevertCurve.rb
FredoTools_ES.lang
FredoTools_FR.lang
FredoTools.plugin
FredoTools.rb
IMAGES_Standard
jointpushpull.rb
JPP_Dir_20
LIBFREDO6_Dir_43
LibFredo6.rb
LibTraductor.rb
ShaderlightLoader.rbs
ShaderlightRubyExtension.bundle
Utilities
utilities.rb

Hi! Thanks Fredo! This will make all the difference for me. Just a little hiccup...
I installed Curviloft 1.2c jsut now, and upon launch sketchup gives me the following errors:
Error Loading File __loader.rb
uninitialized constant TraductorError Loading File bootstrap_Curviloft.rb
uninitialized constant Curviloft::T6Error Loading File CurviloftAlgo.rb
uninitialized constant Curviloft::T6Error Loading File CurviloftCurveMover.rb
uninitialized constant Curviloft::T6Error Loading File CurviloftPalette.rb
uninitialized constant Curviloft::T6Error Loading File CurviloftTool.rb
uninitialized constant Curviloft::T6

I installed LibFredo6 immediately before, and that seems to have taken just fine.

I am running sketchup pro 7 on OS X 10.6.8 (snowleopard)

Thanks!

Success!!

Got it to work.
I was right clicking the app and getting to the plugins that way. Didn't work. When I went the long way to /Library/Application Support/Google Sketchup 7/Sketchup/plugins
then it worked. Different location... truly mattered.

Thanks to all of you for your help!

Good idea to look under preferences, but to no avail.
Being a mac, I can't actively unzip them, when I open the file it does so automatically, and then I copied them from there into the plugins folder.
It should show up under the plugins menu though, right? All I have there is cost.

Thank you for your help though, and I hope that people do continue to add suggestions and advice... I could really use this right now.

Thanks for the tips on how to find the plugins folder and the win and mac zip file!
So, I have the files in the plugins folder, but don't see anything about it inside of sketchup 7 pro, whether under plugins or anywhere else. Any suggestions? Many thanks

Does sketchyphysics work on a mac? If so, how do I install it... not seeing where a plugins folder is.
Thanks!