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You can install gmail client by open the url: http://m.google.com/mail or http://gmail.com/app in you mobile. or try following links. Some version might not work with you mobile.

Gmail Mobile client
V2.0.6 client download link:
http://gmail.com/app/v2.0.6/L1/gmail-nokia-g.jar
http://gmail.com/app/v2.0.6/L1/gmail-g.jar

V1.5.0 download link:
http://gmail.com/app/v1.5.0.1193/L1/gmail-g.jar
http://gmail.com/app/v1.5.0.1193/L1/gmail-nokia-g.jar
http://m.google.com/a/v1.5.0.1193/L1/MailByGoogle.jar

V1.1.1 download link:
http://gmail.com/app/v1.1.1/L1/gmail-g.jar