I have followed the DHIS2 windows installation guide (http://dhis-2.blogspot.com/), however at step 6, where we right click the tomcat.exe, I expect catalina log but in this case it pops up for like a second and disappears. Please help
Welcome to the community @Bee!
Please know that the link you posted is not monitored by the dhis2 core team and might not always be up to date.
For a windows user, it might be recommended to use docker instead. Please have a look at the tutorial available in the DHIS2 Developers portal: DHIS2 in Docker | DHIS2 Developer Portal