Cursor v0.51 has been out for a few days now, but the official download page still doesn't have the v0.51 download links. Here are the official download links for the latest Cursor version v0.51.12that I found on Github (domain: downloads.cursor.com). Feel free to download and try it out if you want to give it a spin.
Cursor 1.5.5 version download links and Cursor v1.5 changelog: Added a Toggle AI Pane icon on the right side of the top menu bar, startup page now displays Chat sidebar, Cursor settings page's 'Tools & Integrations' changed to 'MCP & Integrations'
Today I discovered that Cursor has automatically updated to v1.4.0, and just now I received another update notification. After restarting, I found it had been updated to v1.4.1.