From another TurboCAD user:
(TC Deluxe 19)
Stick with it …
After all we don't buy a new lathe because our existing one's auto-feed clutch is behind the saddle (I kid you not on that one), or we find cutting fine-lead 3-start left-hand Dardalet threads difficult.
…. but see if you can up-date it. NB A full application of industrial CAD software will be of industrial price, but investigate anyway as I will show. There will also be operating differences from earlier versions of course.
My experience explains my stance:
I was never a professional designer and draughtsman but knew the basics of manual engineering-drawing and outside of model-engineering, had to read such drawings at work. I became aware at work of the potential of CAD and despite owning a professional-grade A0 draughting-table, decided to take up CAD, for model-engineering.
At the time the only CAD of any real value readily available to the amateur was TurboCAD, sold by Paul "The Cad" Tracey. He advertised it in ME – I don't know why he has stopped doing so. Anyway I bought my copy of TC 19 Deluxe from his stand at a major model-engineering show.
He trades as PaulTheCAD, Paul Tracey Design Ltd., as a TurboCAD 2D/3D TurboCAD and trainer; and I would suggest you look at his site.
I have just done so and it looks as if TC Deluxe 2020 could give you, certainly me, a reasonably powerful 2D/3Dpackage at sensible cost.
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My copy came with a separate CD tutorial that is not a video but far more useful: a series of talked-through introductory exercises in .pdf format from the start, mainly orthogonal but ending with an isometric rendering. It's a digital equivalent of Harold Hall's book on using milling-machines – though the resulting images are not of real objects like T-nuts you can make for your workshop. (Maybe Messrs Hall and Tracey could collaborate! 
Nevertheless I found it hard to learn too, and found TC's official on-line "Help" document little more than a badly-planned aide-memoire for experienced users.
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After struggling for a while I tried Fusion 360 and Alibre (the latter via MEW's promotional series); but soon realised that would be a mistake. I had made some progress with TurboCAD, and changing to another make would mean learning totally different software from the start. Further, these alternatives enforce 3D-first, greatly complicating it and not necessary for most of my purposes. TurboCAD gives me a straight 2D/3D choice in the same programme. It also has a lively Users' Forum whose professional users include authors of tutorial videos, though these seem aimed mainly at advanced users wanting to make pretty pictures of complicated things.
I had also paid for TurboCAD outright. Alibre would prove more expensive, whether by subscription or straight purchase; there was doubt about the future of Fusion's "free for hobby use" arrangement.
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The problem was that I could not find anything to explain CAD principles of CAD (I knew the basics of technical-drawing, but not those of this extra ocean of skill between drawing and workshop.)
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As for TurboCAD's official , on-line .pdf "manual" from the "Help" button…..
I found though that, surprisingly as it's a pdf file, I could copy-&-paste the "Contents" page straight into MS 'Word' then after appropriate editing, turned it into an alphabetical 'Excel' spread-sheet index in noun-adjective-adjective style. I printed that, and it greatly helps me find the information needed in the document on the screen.