Problems in installing macOS Catalina

I've been trying to update my macOS from Mojave since last year, but it is not working. The download is always stuck at 10.8MB/8.23GB, I have 170GB of free space and I don't think it's the internet because I've been trying to update it in different places. After that it always gave a notice like "Request Timed Out". Are there any suggestions on how to successfully install it? and I am currently using the MacBook Pro 13 inch , 2019