This adapter came out 15 years ago, so drivers only go as far as Windows 7 from out testing.
Moschip USB-Ethernet Adapter driver
File: MCS7830_WHQL.zip
62adce8972f00a76e1d65ab430d6068ef759a6a5c275e2167911f7e2882f86a6
Moschip USB-Ethernet Adapter driver
File: MCS7830.zip
c97f51f4c039c02b429ab0eebf6b3dcc613139d5e4d2207c448bea528654aa1f