Some trustworthy repositories include:
But the safest is the Ralink generic driver. download driver kaiomy wa 54p pro windows 7 free
If the automatic installer fails (common on older Windows 7 builds), you can force the install manually: Some trustworthy repositories include:
Some archived support pages still exist. Search for “Kaiomy support drivers” on the Wayback Machine (archive.org). However, links are often broken. But the safest is the Ralink generic driver
This is common on Windows 7 when trying to install unsigned drivers.