1. open sysdm.cpl
   

2. Switch to the Advanced tab and open “Environment Variables”
   

3. Add a new system variable;
   variable name: COMPlus_Disable_GetTempPath2
   variable value: true
   

4. Attempt the installation/upgrade of ESET Secure Authentication again

5. If succesfull remove the system variable created in step 3.

If above steps do not work, try the steps below:


0a. Download and extract PsExec from https://learn.microsoft.com/en-us/sysinternals/downloads/psexec

0b. open elevated command prompt at the location of the extracted PsExec.exe

1a. type NUL > %TEMP%/esa_saved_installer_session

1b. type NUL > %TEMP%/esa_saved_upgrade_session

1c. type NUL > %TEMP%/esa_saved_upgrade_session_from_removal_to_main

2. echo %TEMP%

<value will be used in step 7>

3. .\PsExec.exe -i -s powershell

<opens a new powershell windows under SYSTEM account>

<proceed in the new window>

4. Get-ExecutionPolicy

<value will be used in step 9>

<if the value is already RemoteSigned, you can skip step 5 and then step 9>

5. Set-ExecutionPolicy RemoteSigned -Scope CurrentUser

6. cd ..\SystemTemp\

7a. New-Item -Force -ItemType HardLink -Name "esa_saved_installer_session" -Value "<path_from_step_2_here>\esa_saved_installer_session"

7b. New-Item -Force -ItemType HardLink -Name "esa_saved_upgrade_session" -Value "<path_from_step_2_here>\esa_saved_upgrade_session"

7c. New-Item -Force -ItemType HardLink -Name "esa_saved_upgrade_session_from_removal_to_main" -Value "<path_from_step_2_here>\esa_saved_upgrade_session_from_removal_to_main"
8. now attempt the installation/upgrade of ESET Secure Authentication again

After succesfull installation / upgrade, perform the following steps:

9a. Remove-Item "esa_saved_installer_session"

9b. Remove-Item "esa_saved_upgrade_session"

9c. Remove-Item "esa_saved_upgrade_session_from_removal_to_main"

10. Set-ExecutionPolicy <value_from_step_4_here> -Scope CurrentUser