If you need a free way to host blocks, just use a shared folder (OneDrive, Google Drive, or local network drive) and point AutoCAD’s Options → Files → Tool Palette File Locations to it. Don’t download random “host file” tools — they’re not what you think.

Here are the best sources for free AutoCAD blocks:

Elias took a breath. He opened the file. He pasted the lines. He hit Save.