Add hint to wait for unzip to finish.

INSTALL.txt

@@ -1,7 +1,7 @@
 # Installing Fritzing
 
 Please make sure your system satisfies one of these requirements:
-Windows 10
+Windows 10, 64 Bit
 Windows 7 was reported to work, too
 Mac - OSX 10.14 and up, though 10.13 might work too. MacOS 10.15 is currently untested.
 Linux - a fairly recent linux distro with libc >= 2.6
@@ -13,10 +13,10 @@ A free unzipping program can be found here, should you need it.
 
 ## Notes on Windows
 
-Unzipping Fritzing might be very slower than the download itself. We recommend
-using 7zip
+On Windows, unzipping Fritzing might be much slower than the download itself. We recommend
+using 7zip.
 
-To start Fritzing on Windows: double-click fritzing.exe
+To start Fritzing on Windows: Wait until unzipping is finished. Then open the destination folder and double-click fritzing.exe
 
 ## Notes on Linux
 To start Fritzing double-click Fritzing, or try ./Fritzing in your shell window
@@ -37,4 +37,4 @@ or, to get rid of the warning permanently:
 1b. go to the System Preferences
 2b. open the Security & Privacy page
 3b. unlock it by clicking the lock in the lower left corner
-4b. set it to allow app downloads from anywhere
+4b. set it to allow app downloads from anywhere