Ok, gotcha. It looks like maybe they probably changed something and it's causing problems for you.
I do get there's a point where upgrading just isn't worth it unless the parts you add are stupid cheap. Like, I have this Dell Optiplex 3020 across the room from me and it's got an i5-4570 in it. Because there's typical Dell fuckery going on, the fastest processor I can throw in it is an i7-4790S, that "S" meaning a low power CPU (i.e 65W). This is because Dell's fuckery in this machine was with the PSU using a proprietary connector to the motherboard instead of a standard ATX connector so more powerful PSU's can't be added. This limits not only the CPU that can be used, but the GPU as well: I have to go with joints that have very low current draw. However, in this day and age, upgrading to the i7-4790 is only $30 from ebay. The current GPU in there is an older Radeon R9-360, which I copped for $21 from ebay. In theory, I could go as high as a Radeon RX 560 'cause they're pretty light on current draw, only about 65W, but I'd have to catch one for like $30 for the 4GB joint to make it worth it.
For your machine, maybe just a CPU upgrade will make the difference and make the game more playable. If you do that and it doesn't work, I'd probably just build a new machine, mainly because the next two steps are more RAM and a faster GPU, both of which might cost more than it's worth.
