Just wanted to say the Environment Variable worked for me. I've had HDRLS for many years and never had a scale issue till the latest version in Max 2025. But the Env Variable did the trick. Thanks.

Update:
After searching my machine I found 'config.ocio' in my custom install location for HDRLS. I assume I add the variable (HDRLS_SCALE_GUI = 2) in it. What's the proper syntax for inserting this line and where?

After receiving the update so that HDRLS installs and opens properly (thanks for that) I'm having other issues. I'm just reporting it here in case others are having the same experience.

I was working on a file in Max 2022 that was pretty heavy, about 2M polys. HDRLS worked pretty well, a bit laggy but I was able to get my work done. I thought this would be a good opportunity to open it in Max 2023 and see if it's any faster. As we all know, Autodesk touts even faster performance with each release of Max. So, let's see.

HDRLS barely is able to perform. In fact, it mostly locks up and I have to 'End Task' it to get out. I've tried 3 or 4 times but I'm finding it unusable with a large file. It might be OK with a small file but I haven't tested that yet. Few of us have small files these days anyway unless we are doing game assets.

So I think there are still some issues with the Max 2023 Vray6 integration. Again, I can achieve my work in Max 2022 so I'm really just reporting my experience with Max 2023 to see if others are having it.

My machine specs are below:
3ds Max 2023 (3D Studio thru Max 2023), GIGABYTE X570 AORUS x570 Master Motherboard, Ryzen 9 3950x CPU, Noctua NH-D15S CPU Cooler, 128 GB G.SKILL Trident Z Neo DDR4 Ram, Sabrent Rocket NVMe 4.0 M.2 drives NVidia RTX 2080 Ti, Space Pilot Pro, Windows 10, Tri-Monitor, Cintiq 13HD