Use PL/SQL developer without installing oracle locally
Download OCI online
As shown below:
If there is no NETWORK directory to manually build the structure: \NETWORK\ADMIN
New file tnsnames.ora in ADMIN directory
document content:
youNETname =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.1)(PORT = 1521)) The address is the database connection address
)
(CONNECT_DATA =
(SID = yourSID)
)
）
Open the PL/SQL with login page and click Cancel directly
Tools-Preferences Enter the path of OIC and 
restart PL/SQL