Mirillis forum

I get the following error when trying to install 3.0.2:

Looks like the installer is failing to write one of the demo/sample video files (99999.m2ts) into the Splash folder. I had a similar issue before and it was caused by Windows permissions / antivirus blocking file creation inside Program Files (x86).

Try these steps:

Completely close the installer.
Delete the folder:
C:\Program Files (x86)\Mirillis\Splash\
if it already exists.
Temporarily disable Windows Defender “Controlled Folder Access” or any antivirus real-time protection.
Right-click the installer → Run as Administrator.
Install to a custom folder instead, for example:
C:\Splash\
instead of Program Files.

If it still fails on the same .m2ts file, it may also mean:

the previous installation left a locked file behind,
disk permissions are corrupted,
or the installer package itself is incomplete/corrupted.

In that case, re-download the 3.0.2 beta installer and try again after rebooting Windows.

You can also press “Ignore” to continue installation and see whether Splash launches normally afterward.

Where did you get 3.0.2 Beta?

Can you provide link?

This error is actually quite rare for me. Have you managed to fix it? Please continue to update and share.

I had a similar installation error before, and it turned out that an old Splash file was still locked by another process. I'd try running the installer as Administrator and completely removing any previous Splash installation folders before installing again.