Adobe Acrobat 2020 has no response

I completed the fresh install and registration with my brand new DIY Lenovo laptop which include licenses for MS Office 2021 and Adobe Acrobat.

Then, I find that the Acrobat has no response whenever the laptop is offline, failing to open any pdf file and even the program itself!

I contact the local(HK) CS of Lenovo. They just refer me to the help link of Adobe after days. And that's why I am here.

I have not tried to connected to the Internet to test if it runs because I need to finish some file management that oneDrive created problems for me whenever there is a connection. I am now using my mobile phone to post here.

I was able to run Adobe Acrobat(by Desktop icon) once after installation and registration.