I want os x 10.10.5 for mac air 1,1 A1237

The Macbook Air A1237 does not support OS X past 10.7.5, your system lacks the necessary hardware, and forcing an OS it was not designed to run could result in complete destabilization of the system, it is not advised.

If you are concerned with security then consider running a UNIX variant like Ubuntu. You can keep OS X and UNIX on the system and boot to whichever one you want.

The leading operating system for PCs, IoT devices, servers and the cloud | Ubuntu

That Mac can't be upgraded past 10.7.5.

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