Microsoft has released the Windows 10 Insider Preview Build 18342.8 (19H1) in Slow Ring. This is the version in the 19H1 development branch that we expect to receive in April 2019 as Windows 10 V1903.
The Insider Preview Build 18342 had already been released on February 21, 2019 in Fast Ring(see Windows 10 Insider Preview Build 18342). Now Microsoft has made a revised version available in the Slow Ring. The announcement and a description of the changes can be found within the Windows Blog.
The bug ‘Launching games that use anti-cheat software may trigger a bugcheck (GSOD)’, which Microsoft already described in the initial release, has not been fixed. For systems where this anti-cheat software is used, Microsoft blocks the installation of the Insider Preview.
Users with the regional setting ZH-CN (China) are excluded from this preview. Microsoft also blocks the distribution of build 18342 for processor models of the Intel64 Family 6 Model 142 and Intel64 Family 6 Model 158, as Martin Geuß writes here.