You already have Microsoft PowerPoint installed. You just created a .pptx file that is 150MB, and you need to shrink it to 10MB.
A user looking for a "highly compressed" setup file of Microsoft PowerPoint (e.g., a 30MB installer instead of a 1GB Office suite). Warning: Official versions of Microsoft Office cannot be "highly compressed" without breaking digital signatures. Most such downloads from third-party sites are illegal cracks, malware vectors, or corrupted archives. Powerpoint Highly Compressed Download
Elias remembered a trick from an old IT colleague. He opened the file and went to the Picture Format tab. He selected one image and clicked Compress Pictures You already have Microsoft PowerPoint installed
Images account for 90% of PowerPoint bloat. Powerpoint Highly Compressed Download