Firstly, afaik no changes have been made to AutoHotkey Basic in over a year. Secondly, AutoHotkey_L hasn't included UPX for a while (since revision 56 iirc) as it was replaced with MPRESS. Finally, see
v1.0.90:
Quote:
Other Changes
In an attempt to solve the anti-virus false positives, I've removed mpress.exe from the installer and have not compressed the other executables. To compress compiled scripts (which also adds a degree of protection), you may need to download MPRESS and place it in the Compiler directory. If you've installed a previous version of AutoHotkey_L, you probably already have mpress.exe.
(This was referring to false positives for the installer and its contents, not specifically compiled scripts.)