Bigdigger plugin have discontinued the free version and there isn't any free version of BugDigger compatible with your version of JIRA. The last free version of BugDigger is v2.4.4 but it is only compatible up to JIRA 6.3.15
Bharat Chawla
I'm New Here 
I'm New Here
Those new to the Atlassian Community have posted less than three times. Give them a warm welcome!
1 answer
Nic Brough -Adaptavist-
Rising Star 
Rising Star
Rising Stars are recognized for providing high-quality answers to other users. Rising Stars receive a certificate of achievement and are on the path to becoming Community Champions.
Bharat Chawla
I'm New Here
I'm New Here
Those new to the Atlassian Community have posted less than three times. Give them a warm welcome!
Nic Brough -Adaptavist-
Rising Star
Rising Star
Rising Stars are recognized for providing high-quality answers to other users. Rising Stars receive a certificate of achievement and are on the path to becoming Community Champions.
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