I just tried to reproduce what you are describing on a brand-new macOS Big Sur 11.1 installation. I don't get such an access prompt when running either the trial version or the Mac App Store version of Textastic for Mac.
What exactly did you do before you got asked for access to the downloads folder?
Which macOS version are you running?
Is this with the trial version or with the version from the Mac App Store?
What kind of Mac do you use? (Intel-based or Apple Silicon?)
Where is the app located? (I could imagine that you could get such a prompt if you are launching the app from the Downloads folder instead of the Applications folder.)
Hello,
I just tried to reproduce what you are describing on a brand-new macOS Big Sur 11.1 installation. I don't get such an access prompt when running either the trial version or the Mac App Store version of Textastic for Mac.