Common in the Google Play Store for upgrading from a "Lite" or "Free" version to a paid, ad-free version (e.g., White Noise ).

Communities like TTD Community use it to offer downloads for older titles like Transport Tycoon Deluxe .

Used by companies like Money S3 to let users try an unlimited-time trial version of their accounting software.

Seen on BERNINA for embroidery design software or TSplus for remote support tools. Gaming & Apps

Often used on sites providing links to download suites like Excel or Office 2021 .