ffms2-r722.7z should help. Extract the dll, exe, and avsi directly into the plugins folder of avisynth, and then use ffvideosource. If you have older index files they won't work, so you'll have to delete the old index file and let it create a new one.
Bigger video files tend to crash avsp/vdub, too, which might be related to the issue you were having. For those, drag the mkv/mp4/whatever file over the ffmsindex.exe file. It'll open a cmd window that will index the video; the cmd will automatically close itself once it is done. This way you should then be able to load the avs for the file you indexed just fine in both avsp and vdub and avoid crashes.
PS: Do avoid DirectShowSource at all costs.
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