Try zip the folder you need to import/install.
Copy the zip to SoftwareAG\IntegrationServer\instances\default\replicate\inbound
From localhost:5555 Packages - Management - Install Inbound Releases.
If it is not working try below way
1.Copy folder(or package) to SoftwareAg- integration server - instances - default - packages.
2.Go to Localhost:5555 - Packages - Management - Recover Packages - Recover the package you need.
3.Go to Activate Inactive packages and activate the package.
4.You can able to view all your code from designer.
Or
Copy the folder to SoftwareAG\IntegrationServer\instances\default\replicate\inbound and try to install from localhost:5555 Packages - Management - Install Inbound Releases.
Good Luck
#webMethods#Flow-and-Java-services#Integration-Server-and-ESB