trial printing; prototype edition
Refers to a preliminary version of a printed work, software, or product made for testing or demonstration before the final release.
This trial printing still has some typos.
We distributed the prototype version of the software to testers.
ベータ版 is a beta version, often used for software, whereas 試作版 can be used more broadly for any trial edition, including print.
Compound of 試作 (trial manufacture) and 版 (edition, version).