Uninstall Old Version Before Install #22
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This PR will resolve some cases of failure in launching OT v1.5 after installing ( see opentoonz/opentoonz#3903 ).
If the installer detects old version of OT in the computer, the installer suggests to uninstall it in advance.
Reference: Inno Setup Script Sample for Version Comparison (Advanced Version); The Half-Blood Programmer by Lex Li