Try this one...

click Help > debug window > Console

type >  getrawtransaction

then enter >

for example:

getrawtransaction aa07c1c93c8aa06b00dda258f38db7abb6d9165c1a5d285f40b612a512363f67

then you will get a long hex string

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then type >

sendrawtransaction

for example:

sendrawtransaction 01000000a731125a02c69b5f273c4e75729a4c7120282ba3186c9006b6ecf4e260efb9e89f44b24 672010000006b483045022100b1c2aa48879c01e78898e36737be7e11497fc51cb9cec00d3348a3 24672015dd0220722a12a8dfabc35c52cb084aa6e69dc7cfdff44c05e6955f540a1e4222a9fa010 12103b1cd1f3f6a08a606780b29a2c01f66d966bf4f282ee31a266b843923f00fa2b8ffffffff76 bc48c852a89a9450cd77f028b78543d9cd8e013d972eefd76d5c065eed9b05000000006a4730440 220612bdca13b6df4013a958d9655a8323cc84e7b53ef1d6d4a118bf27267eae7f602200d83b700 b09cb033492e72ac8544dd7b50a284e1679b8f57158f28cb27baa370012102fb35e9669a51e0533 d56697efd7ef48030aaacfa6817435be180f058d543401bffffffff0238c8e900000000001976a9 144de85963991f8ef1ce34c6b232f4bb47b1c2cc3488ac00ca9a3b000000001976a914d1b152ecf 75e93212e992abfe8577ab3d7c86cde88ac00000000



the conflicted transaction will be send again.

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This might not work to all wallets, sometimes you will get this error after getrawtransaction "No information available about transaction (code -5)"

I see this video on youtube might be a help also https://www.youtube.com/watch?v=Zw1bS14z6Dc