I've got 40 pieces of content, all of which are parts of DLC, that have updates marked 'Not Installed, Payware (Not Active)'. I suspect that this is because of TS3 App:
PRR T1 1942 <kuid:523:1972928>, with updated versions <kuid2:523:1972928:1> and <kuid2:523:1972928:2>
LMS Princess Coronation Blue <kuid:523:19721020>, with updated version <kuid2:523:19721020:1>
LMS Coronation Scot <kuid:523:19721055>, with updated version <kuid2:523:19721055:2>
Aerotrain NYC Loco <kuid:523:19721100>, with updated version <kuid2:523:19721100:1>
NYC Aerotrain <kuid:523:19721104>, with updated version <kuid2:523:19721104:1>
BR Duchess Blue <kuid2:523:19723779:1>, with updated version <kuid2:523:19723779:2>
BN SD60M <kuid2:45324:100046:1>, with updated version <kuid2:45324:100046:3>
BN SD60 <kuid2:45324:100112:2>, with updated version <kuid2:45324:100112:3>
AMTK F40PH ph3 (early) <kuid2:45324:100119:5>, with updated version <kuid2:45324:100119:6>
AMTK F40PH ph3 <kuid2:45324:100122:5>, with updated version <kuid2:45324:100122:6>
AMTK P42DC Heritage phIV <kuid2:45324:100123:1>, with updated version <kuid2:45324:100123:2>
CR C40-8 <kuid2:45324:100158:1>, with updated version <kuid2:45324:100158:2>
CNW C40-8 <kuid2:45324:100159:1>, with updated version <kuid2:45324:100159:3>
BN SD70MAC <kuid2:45324:100165:1>, with updated version <kuid2:45324:100165:3>
BNSF SD70MAC (BN exec patch w/swoosh) <kuid2:45324:100183:1>, with updated version <kuid2:45324:100183:2>
BNSF SD70MAC H2 <kuid2:45324:100185:1>, with updated version <kuid2:45324:100185:3>
CN C40-8 <kuid2:45324:100196:1>, with updated version <kuid2:45324:100196:3>
ATSF C40-8W <kuid2:45324:100202:1>, with updated version <kuid2:45324:100202:2>
KCS SD70MAC <kuid2:45324:100206:1>, with updated version <kuid2:45324:100206:2>
CNW Dash 9-44CW <kuid2:45324:100273:1>, with updated version <kuid2:45324:100273:2>
AMTK P42DC ph V <kuid2:45324:100285:1>, with updated version <kuid2:45324:100285:2>
AMTK P42DC ph III <kuid2:45324:100289:1>, with updated version <kuid2:45324:100289:2>
INRD SD9043MAC <kuid2:45324:100290:1>, with updated version <kuid2:45324:100290:3>
EMDX SD70M Demonstrator 1 <kuid2:45324:100294:1>, with updated version <kuid2:45324:100294:2>
EMDX SD70M Demonstrator 3 <kuid2:45324:100296:1>, with updated version <kuid2:45324:100296:2>
NS Maersk SD40-2 2a1 <kuid2:45324:100345:1>, with updated version <kuid2:45324:100345:2>
QR PB15 (3ft 6in) <kuid2:217537:53:5>, with updated version <kuid2:217537:53:6>
QR PB15 Tender (3ft 6in) <kuid2:217537:58:5>, with updated version <kuid2:217537:58:6>
CHN QJ Classic TRS19 <kuid2:217537:360:10>, with updated version <kuid2:217537:360:11>
CHN C80 unit1B <kuid2:276266:1260:6>, with updated version <kuid2:276266:1260:7>
CHN SS4 A+B <kuid2:276266:1261:2>, with updated version <kuid2:276266:1261:4>
CHN SS4 unit A <kuid2:276266:100024:6>, with updated version <kuid2:276266:100024:7>
CHN SS4 unit B <kuid2:276266:100025:6>, with updated version <kuid2:276266:100025:7>
CHN C80 unit1A <kuid2:276266:100087:6>, with updated version <kuid2:276266:100087:7>
CHN C80 unit1C <kuid2:276266:100089:6>, with updated version <kuid2:276266:100089:7>
CHN C80x3 unit <kuid2:276266:100091:1>, with updated version <kuid2:276266:100091:1>
PRR T1 Fleet of Modernism <kuid:447264:1198>, with updated version <kuid2:447264:1198:2>
CN GP9 phase II (zebra) <kuid2:506034:455619:1>, with updated version <kuid2:506034:455619:2>
CN GP9 phase I <kuid2:506034:455703:1>, with updated version <kuid2:506034:455703:2>
NYC J3a-Dreyfuss <kuid2:661281:35127:5>, with updated version <kuid2:661281:35127:8>