Download spark 2.5.8 source code .Dont want spark 2.6.3 source code

How can I get source code of Spark 2.5.8 ?? Using Svn able to download spark 2.6.3 code but not spark 2.5.8.Please help me.One more thing Does spark 2.5.8 works well with openfire 3.7.1 like file transfer,gmail access?? CAn’t access gmail and do file transfer using spark 2.6.3