Here I will list instructions how to use the mod and tips on how to make the mod work. If you encounter a bug, please post it in the Bugs and Troubleshooting discussion. If you want to post something here, it should be workarounds or other tips to help stuck players.

Research
You need to research autopsy and build an autopsy table. Note that you will only be able to get bionics back from 2nd research (and bill) and up. You can adjust the drop-chance in the mod settings.

Need Material
When you set up a bill for autopsy, you must select the medicine you want to use for that autopsy. The first autopsy you will unlock - butcher for organs - is automatically toggled only to use herbal. Select medicine if you want to use that too. You need to toggle the medicine you have available to use the mod.

Then you also need a fresh corpse. Toggle the corpse as available and make sure it has not been outside of cold temperatures for too long (more on this later). If the corpse have bionics, you will only have a chance at getting these back using "medically extract organs" or better bills.

Remember that you need a pawn with a medicial skill as well. Some bills may have a certain skill requirement.

Corpse Storage
The corpse will decay (with an invisible timer) if not stored in freezing temperatures. For the basic autopsy, this means you will only have a few in-game hours from the pawn died to perform the autopsy. This is very little, but the time limit will increase slightly with each better autopsy. If the "decay" has occurred the only thing you will see is "need material".

Here is a few suggestions to storage. First, in the storage area, under human corpse, toggle "possible to harvest" option. That will make it easier to see when the corpses are available for autopsy. Second, this area should always be freezing, as this stops the decay timer. Having the storage close to the autopsy table is also wise.

If you still have issues with "Need Material" after this, go to the mod settings and tweak the corpse age to something like 9999 (Do not use more than 99999 as it can break the mod for some players). This will not make existing corpses that have passed the decay available again, but it will allow new corpses to be harvest for a long amount of time without needing to freeze them.

Still doesn't work? Try adjusting the harvest chance of organs to 100% and spawn in a new pawn, kill him with command controls, and try harvesting the pawn. If this does not work, it is likely that there is a mod you are using that is somehow incompatible with HOPM.