Update FAQs.md

better pycrypto install instructions for Mac

diff --git a/FAQs.md b/FAQs.md
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@@ -93,7 +93,18 @@ Alternatively, sometimes the execution bit isn't set correctly in the archive. I
 There seems to be a bug in Apple's launch services. Try using the free [Maintenance utility](https://www.titanium-software.fr/en/maintenance.html) from Titanium Software to clear the launch cache and database.
 
 ### The application opens, but always gives an error in the log 'ImportError: No module named Crypto.Cipher'
-Some version of MacOS don't include PyCrpto. Your should be able to install it by using this command in the Terminal app: python -m pip pycrypto
+Some version of MacOS don't include PyCrpto. You'll need to install it manually. In Terminal window:
+
+sudo python -m pip install pycrypto
+
+if error “No module named pip”, type: sudo easy_install pip
+try again: sudo python -m pip install pycrypto
+
+if installation fails because “C compiler cannot create executables” and pop-up window asks you to install Command Line Tools for XCode, agree by clicking “Continue”
+try again: sudo python -m pip install pycrypto
+
+If after installing pycrypto decryption still fails with something about pylzma in error log, try: 
+sudo python -m pip install pylzma
 
 # Using the Tools
 ## I can’t get the tools to work on my rented or library ebooks.