There is no official "trial" for v2.10.1. However, a user named "LS_Archive" maintains a GitHub repository (not affiliated with THS) that stores old changelogs and patchers – though these exist in a legal gray area.
Sign up for Steam key giveaways on subreddits like r/FreeGameFindings or wait for Fanatical bundles. Lossless Scaling is often included in "Build your own Toolbox" bundles for $1.99 – effectively 70% off. Lossless Scaling Free Download -v2.10.1-
Steam allows developers to host legacy branches. Right-click Lossless Scaling in your Steam library > Properties > Betas. If the developer has uploaded "legacy_v2.10.1" you can downgrade immediately. As of 2025, THS sometimes provides these for compatibility testing. There is no official "trial" for v2