Skimp is not working

[emmabice]

Hi there, I am new to Sketchup. I have built a sofa, using cushions brought in from suppliers models I have downloaded from their websites. The result is a very large file of around 100mb. I loaded Skimp to reduce the file size (it was around 80mb) but it won’t work at all now and an earlier try made the file bigger! The buttons won’t let me adjust anthing and I can’t manually type in. i’ve tried doing edges, textures and smooth separately. What am I doing wrong? Apple Studio Max M2, Sketchup Version 24.0.598.