This is the installation guide for Mega Man X: Hard Type.

Things you will need

A Mega Man X (U) 1.1 ROM. Also, the ROM needs to have its HEADER removed (unheadered), which is explained below.
The files included in the Mega Man X: Hard Type download.

There are many versions of Mega Man X ROMs. The only version that works with Hard Type is Mega Man X (U) 1.1, UNHEADERED. Patching over any other version will result in glitches and bugs that will not be supported.

Contents of the Download

The download includes:
The utility tool snesROMutil.exe, by WASABI
The utility tool Lunar_IPS.exe, by FuSoYa
The Mega Man X: Hard Type patch, with an .ips extension.

Does my ROM have a header?

To know if your ROM has a HEADER or not (unheadered), please check its size:
1537 KB = ROM has HEADER
1536 KB = ROM doesn't have HEADER (unheadered). This is the one you need!

Remove the HEADER of your ROM

Removing the HEADER of your ROM is a simple enough process. Open the utility tool snesROMutil.exe. Click open, and select your Mega Man X (U) 1.1 ROM.
Select the option "Remove header", as displayed in the image:

After that, just click OK. There should be a copy of the ROM you opened, but with no header (UNHEADERED), in the same folder as the original. The original ROM will remain unmodified. Applying the patch to your UNHEADERED ROM The only thing left to do now is to apply the patch to your ROM. Open the utility tool LunarIPS. Its interface is simple enough; after opening it, select "Apply IPS patch". After that, it will ask you to select the patch, and then the ROM that you want to patch. After patching the ROM with the patch, all you need to do is run the ROM with your preferred SNES emulator.