I had my friend download the 2019 R2 again on 30 May, 2020, as it is supposed to contain a new license file. He then mailed me the new license file to replace the old one. I followed the procedure as stated in the photo attached to my post (Sorry I forgot  to add it to my post before)  

No I didn't try installing 2020 R1. I kinda wanna stick to the same version.