To resolve the issue of Turbolearn AI downloads getting stuck at 90%, follow these steps:

1. Check Your Internet Connection: Ensure that you have a stable and fast internet connection. Inconsistent connectivity can hinder downloads.

2. Log Out and Log Back In: Sometimes, session-related issues can cause downloads to fail. Sign out of your Turbolearn account and log back in to refresh the session.

3. Clear Browser Cache and Cookies: Accumulated cache and cookies may interfere with downloads.

- For Google Chrome, go to Settings > Privacy and security > Clear browsing data. Select 'Cookies and other site data' and 'Cached images and files', then click Clear data.

4. Try a Different Browser: If the issue persists, switching to a different web browser may help. Use browsers like Firefox, Edge, or Chrome to see if the problem continues.

5. Disable Browser Extensions: Some extensions can conflict with downloads. Disable all extensions temporarily, especially any related to download management or security.

6. Check Firewall and Antivirus Settings: Ensure that your firewall or antivirus isn't blocking the download. You may need to adjust settings or temporarily disable them to allow the download.

7. Download from Different Devices: If possible, try downloading the PDFs from a different device to see if the issue is device-specific.

8. Reattempt the Download: After performing the above steps, try downloading the PDFs again.

If the problem continues after trying these steps, consider reaching out to Turbolearn support for further assistance. More information and resources are available on the Turbolearn website - learn more - learn more.