Yes, I made the MS store install to other drive as my C drive is small 100 Gig SSD and was running out of space due to FSX installation; F drive though is 500 Gig SSD. I guess it is time to remove FSX now that I am fully with MFS 
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I will point the Windows store back to C along with moving the sim to C via the Add Remove program feature. Thanks!
While researching this, another point that I noted is that a lot of people get CTDs after adding a new scenery from marketplace if that scenery is already in rolling cache. For marketplace downloads it should be possible to clear the downloaded scenery from rolling cache after the new scenery for same region/airport is downloaded and that will probably avoid a lot of CTDs. No?
if you have a line with Asobo, probably this can be highlighted to them. Chances are, they already know this and are working to fix it.