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I am guessing that the index is in the last "Larvaevorinae" volume in the series (64g. Larvaevorinae - Larvavorini (Tachinini)). I don't have a copy here (still) but that would be my guess why it doesn't have an index in your volume.

I have a scan of the original French manuscript, which is better than nothing - but (with so many margin corrections, no index or figures and missing/duplicated pages) only *just* better than nothing! ;)

I believe that anyone who scans and translates the published Die Fliegen tachinid volumes will be doing tachinid studies a very great favour. As Theo said, there is no reason to have it in northern Europe but as you move south and east you need it's coverage for the extra species. It is out of date (after 20-30 years anything is out of date) but it is the foundation of palearctic tachinid identification and onto this you can apply the latest updated revisions of different genera, such as the recent Phasia one.

Di-dier: this is always a problem with tachinids - you have a name but little confidence because they have so few really distinguishing features that prove you got it right. The authors of these keys all had access to huge collections that they used to compare with new material but for us novices it can be very hard.

I would just recommend that you double-check anything doubtful and trust your skills. Check that your specimen looks roughly like the named photos in the gallery and whenever possible show your specimens to experts like Theo and/or take them to a good national collection where possible. I would be happy to look at anything that you find doubtful if nobody else can help :)