MtgaLauncher.exe - hxxps://magic.wizards.com/en/mtgarena is whitelisted, it creates a “MTGAInstaller.exe” in TEMP directory and launches it, the installer displays an error box:
The TEMP folder is located on a virtual disk ImDisk - hxxps://sourceforge.net/projects/imdisk-toolkit/ - I guess this causes the problem but I really like to have my TEMP there.
Turning OFF the firewall allows to run MTGA launcher with no problem.
Windows was installed about a month ago, I’m using only GlassWire 2.1.158 Basic (Steam key) and didn’t used any other firewall or internet security solutions.
Guessing the same, should be the combination of virtual drive and your TEMP folder within. MTGA Updater works fine for me me through the latest gw versions on local TEMP folder.