Those permanent fixes increase stability, although most will play full campaigns with unmodded 0.81aV2 and not experience a crash. Even if you don't get them installed, don't worry. If you do get a crash, you'll need to verify that you've got them though.
EB puts some files in the vanilla structure, so you may experience some change in graphics and the like. This is why we encourage making a copy of the 1.5 RTW for EB, in addition to that EB might interfere with other mods for the same reason. Vanilla should still play well though. But if you've played M2TW for a bit, you will probably not enjoy vanilla RTW much, just a warning.
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