Because you cannot download this from the official store anymore, you must be careful when downloading .XAP files from third-party websites.
Although development has stopped, the last version of UC Browser remains functional for basic browsing on older devices. Key Features of UC Browser on Windows Phone
Because the Windows Phone Store is permanently offline, installing UC Browser requires a process known as . To do this on a legacy device today, your Windows Phone must typically be developer-unlocked or jailbroken (using tools like Interop Tools or WPInternals). Prerequisites A Windows Phone running WP 8.0, 8.1, or Windows 10 Mobile. A Windows PC.
While UC Browser is functional, it has a history of significant security and privacy issues: