Cisco IOS Download

I am currently working on s home lab in order to pass the CCNA exam in two weeks.
I have secured some older gear that was not in use but should do the job with the latest IOS versions.

My current working devices consist of a 2610 router, a 1605 router, and a 1720 router and a working 2950 switch.

I am looking for an IOS for a 1900 Series switch that offers CLI (enterprise edition).

I also have a cisco WS-C3512-XL that will not allow me to change encapsulation or set VTP.

I would like to VLAN with the 3512 and 2950, and also setup etherchannel.

Again, all of this is for pratice and testing.

Thanks for any help you can provide.