Unlike the current free version, you don't need a constant internet connection to model. Extension Support:

The Ultimate Guide to Safely Downloading SketchUp 2017 Make (Verified)

of SketchUp Pro. Consequently, the official SketchUp Make 2017 download link was permanently removed to ensure users use secure, updated software that complies with modern operating system standards. Sawmill Creek Woodworking Community Verified Legacy Download Sources

When you first launch SketchUp 2017 Make, it will start a mandatory 30-day trial of SketchUp Pro . This is normal. Once the 30 days expire, the software automatically reverts to the permanent, free "Make" version for personal use. Troubleshooting Common Compatibility Issues

Have you already downloaded a file and want help ? Are you planning to use any specific plugins or extensions ?

These risks are , and Trimble explicitly warns users to upgrade to a more secure version of SketchUp. However, many people still choose to run Make 2017 because it works well for basic modeling, runs completely offline, and is perfectly adequate for non‑professional projects. The decision is ultimately yours.