Aspnet_compiler.exe error code 1 during UCX Suite update
Applies to:
UCX Suite, any version
Description
An error related to aspnet_compiler.exe occurs during update:

check the installation logs %temp%\SetupLogXXXXXXXX.txt
2021-06-04 14:52:03.740 -- Operation --
2021-06-04 14:52:03.740 Name: PIOPrecompileIISAppForBib
2021-06-04 14:52:03.740 Executing: "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe" -m /LM/W3SVC/1/ROOT/fwbib
2021-06-04 15:00:15.567 Execution completed with return code: 1
2021-06-04 15:00:15.567 This is an error return code.
2021-06-04 15:00:15.567 Operation failed.
2021-06-04 15:00:15.567 [ERROR] Program "aspnet_compiler.exe" returned error code 1.
Cause "The file does not exist"
This error occur when you try to execute this command in a Command Prompt "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe" -m /LM/W3SVC/1/ROOT/fwbib

Setup could fails on update when a corrupted Call Analytics info file was previously created:
<IUCS Root>\Apps\BillyBlues\Engine\Web\BINFO
Solution "The file does not exist"
Delete this folder and click on retry
<IUCS Root>\Apps\BillyBlues\Engine\Web\BINFO
Cause "Could not execute CVTRES.EXE"
In some cases, the same error could appears if Windows permissions are not enough to execute the installation correctly.
This error occurs when you try to execute this command: "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe" -m /LM/W3SVC/1/ROOT/fwbib

Solution "Could not execute CVTRES.EXE"
If it is the case, or, if you are not sure about execution permission level allowed, run the Installation package as "SYSTEM" user as reported here.