Please add your code inside app/code/PayUMCitrus/Pumcp folder and run below command from CLI,
php bin/magento setup:upgrade php bin/magento setup:static-content:deploy -f php bin/magento setup:di:compile php bin/magento cache:flush
Please check your domain path and access is proper. Using above methods your extension is installed fine in magento2.
Check whether your entry generated or not in setup_module table.
i have tried all the ways, but still there is no luck. Just to keep you posted i have a addon domain for one hosting account. the primary one is working fine but the addon one is having problem. Is it something related to permission?? Please help??
Please check the case sensitiveness. It should be "app/code". But in their documentations, it is "app/Code".
Please change the path as "app/code/PayUMCitrus/PayUMCitrus"