This occurs if you are using a pirated outdated repack. An updated legitimate portable copy (from your Steam folder) will never expire.
Third-party benchmarks consistently confirm the efficacy of Lossless Scaling, particularly on modest hardware: lossless scaling portable updated
The developer of Lossless Scaling (Taisen) does not officially provide a portable version on Steam. The Steam version requires the client to run. However, the software is DRM-free once downloaded. This means: This occurs if you are using a pirated outdated repack