Please, I need help: can't (re)install / continue to use. (Solved!)

Please, I need help with the following.

I have been a SiYuan user for several months now.

From time to time, when trying to open the software, this message appears:

⚠️ 内核程序丢失 Kernel program is missing 内核程序丢失，请重新安装思源，并将思源内核程序加入杀毒软件信任列表。 The kernel program is not found, please reinstall SiYuan and add SiYuan Kernel prgram into the trust list of your antivirus software.
C:\Users\francisco.barros\AppData\Local\Programs\SiYuan\resources\kernel\SiYuan-Kernel.exe

I usually just close this window and try to open it again. It works the second time, the program opens.

But today I repeated this process and it didn't work. So I downloaded the installer (Windows Installer x86_64). I started the installation and during this process Windows Defender reports about PUA:Win32/PAckunwan.

I tried several options: remove from the device and even allow on the device. When I choose allow, a new pop-up window opens asking for administrator credentials. The title of the window is: Do you want to allow this app to make changes to your device?"

I do not provide the credentials.

I do not recall this being requested in other version upgrades.

So, SiYuan does not open.

I noticed that SiYuan\resources\kernel folder becomes empty.

I appreciate any help.