The system requirements for Google SketchUp Pro 2015 are:

"Portable" versions found on third-party sites are unofficial and frequently bundled with or stability bugs. Current Alternative: SketchUp is now owned by Trimble. They offer a free web-based version that requires no installation and is always up to date. system requirements for the 2015 version, or would you prefer a link to the official free web version

Older computers that cannot run the latest "heavy" graphics requirements of SketchUp 2023 or 2024 may still handle the 2015 version smoothly.

The Guide to Google SketchUp Pro 2015 (Version 15.2.687) Portable